1.  What is the rate of compound interest ?

 I. The principal was invested for 4 years.

II. The earned interest was ₹ 1491.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer

Answer: Option D

Explanation:

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

Amount = ₹ P 1 + R 4
100

C.I. = P 1 + R 4 - 1
100

P 1 + R 4 - 1 = 1491.
100

Clearly, it does not give the answer.

∴ Correct answer is (D).