The present value of a machine is 7,290. If it depreciates by 10% yearly, what was its value 3 years ago? MCQ with Answer and Explanation

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The present value of a machine is 7,290. If it depreciates by 10% yearly, what was its value 3 years ago?

A. 10000

B. 12000

C. 9000

D. 11000

Answer: Option A

Solution (By JKSSB Mock Tests)

V_past = 7290 / (0.90)^3 = 7290 / 0.729 = 10000.

This question belongs to: Maths Percentage

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Question #1

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A can do a work in 15 days and B in 20 days. They work together for 6 days, then A leaves. In how many more days will B finish the remaining work?

A. 4 days

B. 5 days

C. 6 days

D. 8 days

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Correct Answer: Option C

Explanation:
Work done in 6 days = 6×(1/15+1/20)=6×(7/60)=7/10. Remaining=3/10. B's rate=1/20, time = (3/10)×20=6 days.

This question belongs to: Maths Percentage

Question #2

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A man gave 20% to his wife, 25% of remainder to his son, 30% of remainder to his daughter, and the rest Rs. 16800 to charity. Total amount:

A. 37500

B. 40000

C. 36000

D. 35000

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Correct Answer: Option B

Explanation:
Wife 20%, left 80%. Son 20% of total (25% of 80), left 60%. Daughter 18% of total (30% of 60), left 42% = 16800 → total=40000.

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Question #3

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The price of sugar is decreased by 20%. By what percent must a householder increase its consumption so that expenditure does not change?

A. 25%

B. 20%

C. 15%

D. 30%

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Correct Answer: Option A

Explanation:
New price 0.8, consumption multiplier = 1/0.8 = 1.25, increase 25%.

This question belongs to: Maths Percentage

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