A businessman’s earning increases by 25% in one year but

A businessman’s earning increases by 25% in one year but decreases by 4% in the next year. Going by this pattern, after 5 years, his total earnings would be Rs.72000. What is his present earning ?

Let the business man’s present earning be Rs. x.
According to the question,

x ×	125	×	96	×	125	×	96	×	125	= 72000
	100		100		100		100		100

⇒ x ×	5	×	24	×	5	×	24	×	5	= 72000
	4		25		4		25		4

⇒ x ×	9	= 72000
	5

⇒ x =	72000 × 5	= Rs. 40000
	9