Ram invests Rs. X at Y% per quarter for 10 years. The total simple interest accumulated for 10 years is:
Solution
$S.I~=\frac{P\times R\times N}{100}=\frac{X\times 4Y\times 10}{100}=\frac{2XY}{5}$
[Note that Y% is paid quarterly. On an annual basis, it is 4Y%.]
Hence the correct option is D.