Loading...

Lesson: Intermediate Problem Solving - 20t01

Practice: Unlikely Answer Choices

[Page 20 of 27]
Use your knowledge of unlikely or trap answers to identify the culprit choices in the following question, then select the correct answer and then click Continue.

The price of a certain stereo is discounted by 10 percent, and the reduced price is then discounted by 25 percent. This series of successive discounts is equivalent to a single discount of
28.00%
31.50%
32.50%
34.00%
35.00%

Choice (E), 35.00%, is equal to the sum of the two discount percents. However, this problem (and many Problem Solving percent questions) involves a successive percent change. This means we must find the price of the stereo after the first discount, and then apply the second discount to the new price. We cannot simply add the individual percents. Choice (E) is a trap answer.

Choice (C) is correct. Picking 100 as the original price of the stereo, we find:

Price after first discount: $100 × 0.10 = $10; $100 – $10 = $90

Price after second discount: $90 × 0.25 = $22.50; $90 – $22.50 = $67.50

Total discount: $100 – $67.50 = $32.50; $32.50 is 32.50% of $100.

Back Next

Next to display next topic in the chapter.

Video Lessons and 10 Fully Explained Grand Tests

Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.

More for You
All in this Category

You may be interested in

Edwardes College - Peshawar

Edwardes College - Peshawar is a po ...

Colleges in Islamabad

A comprehensive list of major colle ...

Interviews

How to deal with job or admission I ...

Boost your Memory

Concrete methods to improve memory. ...

PPSC - Research Officer Exam

Learn about the exam of PPSC - Rese ...

ISSB Thematic Apperception Tests

Learn what are ISSB Thematic Apperc ...

LUMS - Business Degrees

LUMS: Lahore University of Manageme ...

DMCD - BDS

De Montmorency College of Dentistry ...