What is the rate of compound interest? I. The principal was invested for 4 years. II. The earned interest was Rs. 1491.

Let Principal = Rs. P and Rate = R% p.a. Then,

Amount=  $Rs.P1+\frac{R}{100}4$

 C.I =  $P1+\frac{R}{100}4-1$

  $P1+\frac{R}{100}4-1=1491$

Clearly, it does not give the answer