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 Question: There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of Rs. 12,000 after 3 years at the same rate?

A.            Rs. 2160

B.            Rs. 3120

C.            Rs. 3972

D.            Rs. 6240

E.            None of these

Answer : Option C

Let P = Rs100, Then, S.I. Rs. 60 and T = 6 years.

R =		100 x 60		= 10% p.a.
		100 x 6

Now, P = Rs. 12000. T = 3 years and R = 10% p.a.

C.I.	= Rs. 12000 x ( {1 + 10 )  3 - 1 ) 100
	= Rs. 12000 x 331 1000
	= 3972.