Discuss ISTQB CTFL-Foundation Exam Topic 3 Question 54

A system calculates the amount of customs duty to be paid:

_ No duty is paid on goods value up to, and including, $2,000.

_ The next $8,000 is taxed at 10%.

_ The next $20,000 after that is taxed at 12%.

_ Any further amount after that is taxed at 17%.

To the nearest $, which of these groups of numbers fall into three DIFFERENT equivalence classes?

A$20,000 $20,001 $30,001

B$2,000 $2,001 $10,000

C$2,000 $8,000 $20,000

D$1,500 $2,000 $10,000

Suggested Answer: B

Equivalence partitioning divides input data into partitions where each partition is expected to be treated the same way by the system. The values $2,000 (no duty), $2,001 (taxed at 10%), and $10,000 (partially taxed at 12%) fall into three different equivalence classes based on the provided tax brackets, ensuring different behaviors for each class.

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15 comments · newest first

Eloisa 1 month ago

Exactly! A is solid. It covers all ranges effectively.

Cyril 1 month ago

True, A has $20,000 and $30,001. They fall into different brackets.

Elizabeth 1 month ago

But B has two values under $2,000. That might not work.

Eloisa 2 months ago

I’m leaning towards option B. The values are clearly distinct.

Cyril 2 months ago

I feel like option A is the best choice. Different classes for sure!

Elizabeth 2 months ago

This question is tricky! I think it tests our understanding of tax brackets.

Altha 2 months ago

I didn't know it was that complicated!

Lashawna 2 months ago

The 10% tax kicks in after $2,000!

Lauran 2 months ago

Wait, are we sure about that?

Bethanie 3 months ago

Totally agree, option A is different classes!

Julio 3 months ago

The first $2,000 is duty-free.

Vicky 3 months ago

I’m leaning towards option B because $2,000 is duty-free, while $2,001 would incur a tax, but I’m not entirely confident.

Brent 3 months ago

I feel like I’ve seen a similar question before, but I’m confused about how $2,000 and $2,001 would be treated differently.

Deeann 3 months ago

I think option A might be correct since $20,000, $20,001, and $30,001 would fall into different tax brackets.

Jettie 4 months ago

I remember we talked about equivalence classes in class, but I'm not sure how to apply it here with the different duty rates.

ISTQB CTFL-Foundation Exam - Topic 3 Question 54 Discussion