Machine depreciates 10% per year. Present value Rs. 81,000, value 2 years ago was: MCQ with Answer and Explanation

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Machine depreciates 10% per year. Present value Rs. 81,000, value 2 years ago was:

A. 90,000

B. 1,10,000

C. 1,20,000

D. 1,00,000

Answer: Option D

Solution (By JKSSB Mock Tests)

Value 2 years ago = 81000 / (0.9×0.9) = 1,00,000.

This question belongs to: Maths Percentage

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Question #1

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Employees reduced in ratio 5:4, wages increased in ratio 6:7. Wage bill ratio initial:final:

A. 10:9

B. 15:14

C. 9:10

D. 14:15

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Correct Answer: Option B

Explanation:
Initial bill = E×W. Final = (4/5)E×(7/6)W = (28/30) = 14/15 initial. Ratio initial:final = 1:(14/15) = 15:14.

This question belongs to: Maths Percentage

Question #2

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A shopkeeper sells an article at 20% profit. Had he bought it at 10% less and sold it for Rs. 30 more, he would have gained 40%. Find the cost price.

A. Rs. 500

B. Rs. 450

C. Rs. 550

D. Rs. 400

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Correct Answer: Option A

Explanation:
CP=x, SP=1.2x. New CP=0.9x, new SP=1.2x+30 = 1.4×0.9x = 1.26x → 0.06x=30 → x=500.

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Question #3

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Two numbers are 20% and 30% more than a third. Ratio of the two numbers:

A. 13:14

B. 12:13

C. 10:11

D. 11:12

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Correct Answer: Option B

Explanation:
Third=100, first=120, second=130, ratio 120:130 = 12:13.

This question belongs to: Maths Percentage

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