Numeracy (UPSC)

Basic Maths (Class 10) Number Series

Q. A shopkeeper sells an item for $120, making a profit of 20%. What was the cost price?

Solution

Let cost price be x. Then, 120 = x + 0.2x => 120 = 1.2x => x = 100.

Correct Answer: A — $80

Q. If a number is increased by 25%, what is the new number if the original number is 80?

Solution

New number = 80 + (25/100) * 80 = 80 + 20 = 100.

Correct Answer: C — 100

Q. What is 25% of 80?

Solution

25% of 80 = (25/100) * 80 = 20.

Correct Answer: B — 20

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