If $P Is Invested in a Bank Account Earning R $B=f(P, r, t)=P e^{n / 100}$

Essay

If $P is invested in a bank account earning r% interest a year, compounded continuously, the balance, $B, at the end of t years is given by $B=f(P, r, t)=P e^{n / 100}$ Find $\partial B / \partial P$