A man's salary is increased by 10% in the first year, by 20% in the second year, and decreased by 10% in the third year. If his final salary is Rs. 35640, find his initial salary. MCQ with Answer and Explanation
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Question #1
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A and B can do a work in 12 days. B and C in 15 days. A and C in 20 days. If A, B, and C work together, how long will they take?
Correct Answer: Option B
Explanation:
2(A+B+C) = 1/12 + 1/15 + 1/20 = (5+4+3)/60 = 12/60 = 1/5 → A+B+C = 1/10. Together 10 days.
2(A+B+C) = 1/12 + 1/15 + 1/20 = (5+4+3)/60 = 12/60 = 1/5 → A+B+C = 1/10. Together 10 days.
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Maths
Percentage
Question #2
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Original salary 20000, increased 10% then decreased 10%. Final salary:
Correct Answer: Option D
Explanation:
20000×1.1×0.9 = 19800.
20000×1.1×0.9 = 19800.
This question belongs to:
Maths
Percentage
Question #3
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The population of a town increases by 10% in the first year and decreases by 10% in the second year. If the present population is 19800, what was it 2 years ago?
Correct Answer: Option B
Explanation:
Present = original × 1.1 × 0.9 = 0.99 original. So original = 19800/0.99 = 20000.
Present = original × 1.1 × 0.9 = 0.99 original. So original = 19800/0.99 = 20000.
This question belongs to:
Maths
Percentage
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