- A
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Products[Category])))
ALLSELECTED keeps the filter context from the visual's slicers but removes the category filter, giving the total for all categories.
- B
% Total Sales = SUM(Orders[SalesAmount]) / CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Orders))
Why wrong: This would not filter by category properly.
- C
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLEXCEPT(Products, Products[Category])))
Why wrong: ALLEXCEPT keeps the Category filter, so the denominator would be the same as the numerator.
- D
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALL(Products)))
Why wrong: ALL(Products) removes all filters on the Products table, including slicers, which may not be desired.
Quick Answer
The correct DAX expression is % Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Products[Category]))). This works because ALLSELECTED preserves the current filter context from slicers or page-level filters while removing the row context from the Category column, ensuring the denominator reflects the total sales of all categories currently visible in the report. On the Microsoft Power BI Data Analyst PL-300 exam, this question tests your understanding of filter modification functions for percentage-of-total calculations in matrix visuals—a common scenario where ALL would incorrectly ignore user selections and ALLEXCEPT would over-filter. The key trap is confusing ALLSELECTED with ALL: remember that ALLSELECTED respects external filters, making it ideal for dynamic percentages that respond to slicers. Memory tip: think “ALLSELECTED = All Selected filters stay, only the row filter goes away.”
PL-300 Model the data Practice Question
This PL-300 practice question tests your understanding of model the data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are a Power BI developer for an e-commerce company. You have a semantic model that contains a table named Orders with columns: OrderID, CustomerID, OrderDate, ProductID, Quantity, and SalesAmount. You also have a table named Products with columns: ProductID, ProductName, Category, and Price. You need to create a measure that calculates the percentage of total sales for each product category. The measure should be used in a matrix visual with Category on rows. Which DAX expression should you use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Products[Category])))
Option A is correct: ALLSELECTED respects the current filter context for the denominator, giving the correct percentage. Option B uses ALL, which removes all filters, not just the category. Option C uses ALLEXCEPT, which removes filters from all columns except Category, which is not what is needed. Option D is incorrect syntax.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Products[Category])))
Why this is correct
ALLSELECTED keeps the filter context from the visual's slicers but removes the category filter, giving the total for all categories.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
% Total Sales = SUM(Orders[SalesAmount]) / CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Orders))
Why it's wrong here
This would not filter by category properly.
- ✗
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLEXCEPT(Products, Products[Category])))
Why it's wrong here
ALLEXCEPT keeps the Category filter, so the denominator would be the same as the numerator.
- ✗
% Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALL(Products)))
Why it's wrong here
ALL(Products) removes all filters on the Products table, including slicers, which may not be desired.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PL-300 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this PL-300 question test?
Model the data — This question tests Model the data — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: % Total Sales = DIVIDE(SUM(Orders[SalesAmount]), CALCULATE(SUM(Orders[SalesAmount]), ALLSELECTED(Products[Category]))) — Option A is correct: ALLSELECTED respects the current filter context for the denominator, giving the correct percentage. Option B uses ALL, which removes all filters, not just the category. Option C uses ALLEXCEPT, which removes filters from all columns except Category, which is not what is needed. Option D is incorrect syntax.
What should I do if I get this PL-300 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PL-300 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
This PL-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-300 exam.
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