If Compound Interest on a certain sum for 2 years at 5% p.a. is Rs.328, the Simple interest will be ?
Choose one:	A) Rs. 320	B) Rs. 321	C) Rs. 322	D) Rs. 323	E) Rs. 324
Solution:   Suppose, Compound Interest for first year = Rs. 100   Then, Compound Interest for second year =100 + 5% (100) = Rs. 105   Total Compound Interest for two years = (Rs. 100 + Rs. 105) = Rs. 205   And Simple Interest for two years = 2 x Rs. 100 = Rs. 200   If Compound Interest is Rs. 205, Simple Interest = Rs. 200   If compound interest is Rs.1, then simple interest = 200/205   If Compound Interest is Rs. 328, Simple Interest = Rs.328×200/205= Rs. 320   Rs. 320nswer Rs. 320
<result>A</result>
If Compound Interest on a certain sum for 2 years at 5% p.a. is Rs.328, the Simple interest will be ?