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

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.
A. Rs. 30000
B. Rs. 27000
C. Rs. 25000
D. Rs. 32000
Answer: Option A
Solution (By JKSSB Mock Tests)
Multiplier = 1.1 × 1.2 × 0.9 = 1.188. Initial = 35640/1.188 = 30000.

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Question #1
Spends 15% rent, 10% food, 20% education, 25% others, saves Rs. 15000. Salary:
A. 45000
B. 55000
C. 40000
D. 50000

Correct Answer: Option D


Explanation:
Total spend 70%, save 30% = 15000, salary = 15000/0.3 = 50000.

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Question #2
What is 30% of 400 minus 15% of 200?
A. 100
B. 80
C. 90
D. 70

Correct Answer: Option C


Explanation:
30% of 400 = 120, 15% of 200 = 30, difference = 90.

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Question #3
A number increased by 30% then decreased by 30% results in net change of:
A. 9% increase
B. 9% decrease
C. 0%
D. 6% decrease

Correct Answer: Option B


Explanation:
1.3 × 0.7 = 0.91, 9% decrease.

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