The difference between C.I. and S.I. on an amount of Rs. 15,000 for 2 years is Rs. 150. What is the rate of interest per annum?  Pick.
A) 8
B) 2
C) 10
D) 4
E) 6
Explanation:   [15000 * (1 + R/100)2 - 15000] - (15000 * R * 2)/100 = 150   15000[(1 + R/100)2 - 1 - 2R/100] = 150   15000[(100 + R)2 - 10000 - 200R]/10000 = 150   R2 = (159 * 2)/3 = 100 =&gt; R = 10   Rate = 10%   Answer: Option 10
<result>C</result>
The difference between C.I. and S.I. on an amount of Rs. 15,000 for 2 years is Rs. 150. What is the rate of interest per annum?