An investment of \displaystyle PP dollars is compounded \displaystyle nn-times per year at a constant annual interest rate of \displaystyle r\%r%. The amount of money \displaystyle A(t)A(t) that you have after investing for \displaystyle tt years is given by the equation A(t) = P\left(1+\frac{r}{n}\right)^{nt}. A(t)=P(1+
n
r
​
)
nt
.

How much money would you have after 18 years if you invested $15,000 at an annual interest rate of 4% where the interest is compounded monthly? Round to the nearest dollar.