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

• Let P = Rs. 100. 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 = Rs. 3972
  1000
• 11 years agoHelpfull: Yes(0) No(1)
• Let P = Rs. 100. Then, S.I. Rs. 60 and T = 6 years.
  ∴ R = (100 x 60)/(100 x 6) = 10% p.a.
  
  Now, P = Rs. 12000. T = 3 years and R = 10% p.a.
  ∴ C.I. = Rs.12000((1+10/100)^2)-1)
  = Rs.3972
• 11 years agoHelpfull: Yes(0) No(2)