A businessman 39 s earning increases by 25 in one year but decreases by 4 in the next After 5 years ...........

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A businessman's earning increases by 25% in one year but decreases by 4% in the next. After 5 years his total earnings would be Rs. 72,000. What is his present earning?

10000

80000

40000

54000

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Explanation:

The business man's earning after five years = Rs. 72,000,
Let his earnings be Rs. 100,
After 1st year   -     125 (25% increase)
After 2nd year -     120 (4% decrease)
After 3rd year   -     150 (25% increase)
After 4th year - 144 (4% decrease)
After 5th year -     180 (25% increase)
Earning today = 100/180 x 72000
= 40000