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? MCQ with Answer and Explanation
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?
A. 18000
B. 19000
C. 20000
D. 21000
Answer: Option C
Solution (By JKSSB Mock Tests)
Present = original × 1.1 × 0.9 = 0.99 original. So original = 19800/0.99 = 20000.
A man's income is 80% of his friend's income. The friend's expenditure is 60% of his income. If the man saves 30% of his income and the friend saves Rs. 4000, what is the man's income?
Explanation:
Let friend's income = F. Friend saves 40% of F = 4000 → F = 10000. Man's income = 80% of F = 8000. Man saves 30% of 8000 = 2400. So answer Rs. 8000.
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