The simple and compound interest that can be earned in two years at the same rate is Rs 4000 and Rs 4180 respectively. What is the rate (percent perÂ annum) of interest?

The simple and compound interest that can be earned in two years at th

1.	The simple and compound interest that can be earned in two years at the same rate is Rs 4000 and Rs 4180 respectively. What is the rate (percent perÂ annum) of interest?
A.	18
B.	4.5
C.	9
D.	12
Answer» D. 12