The compound interest on Rs. 12,000 for 10 years at the rate of 12% per annum compounded annually is?

∵ A = 12,000(1 + 12/100)¹⁰
= 12000(28/25)¹⁰
⇒ log A = log 12000 + 10[log 28 - log 25]
⇒ log A = 4.0792 + 10(1.4472 - 1.3979)
= 4.0792 + 0.493
= 4.5722
∴ A = antilog 4.5722 = 37342
C.I. = 37342 - 12000 = 25342
=25350