There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of $ 12,000 after 3 years at the same rate?  Choose the correct choice:
A) $2160
B) #3120
C) $3972
D) $6240
E) NONE OF THESE
Let P = $ 100. Then, S.I. $. 60 and T = 6 years.   R = 100 x 60 = 10% p.a.   100 x 6   Now, P = $ 12000. T = 3 years and R = 10% p.a.   $3972.I.	= $ 12000 x 1 +	10 3	- 1   100   = $ 12000 x	331   1000	=3972   ANSWEWR : $3972 3972
<result>C</result>
There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of $ 12,000 after 3 years at the same rate?