Interest of principal Rs. `p` on `n` years at the rate of `r%` compound interest per annum when interests are calculate `m` times per year `=`
A. `Rs.p(1+(r/m)/100)^(mn)`
B. `Rs. P(1+(r/m)/100)^(n)`
C. `Rs. P(1+(r/m)/100)^(m)`
D. `Rs . P(1+(rm)/100)^(mn)`