Amount earned after 5 years is $ 9030.5561
Solution:
The formula for compound interest, including principal sum, is:
![A = p(1+(r)/(n))^(nt)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/gz3jxn9e7k76t52kd2ev86y7fxnr1jbhoq.png)
A = the future value of the investment including interest
P = the principal investment amount
r = the annual interest rate in decimal
n = the number of times that interest is compounded per unit t
t = the time the money is invested
From given,
p = 5000
t = 5 years
![r = 12 \% = (12)/(100) = 0.12](https://img.qammunity.org/2021/formulas/mathematics/middle-school/9idqixbsmqo1jpwgkdeh0rgh5css5dlfvv.png)
n = 4 ( since interest is compounded quarterly )
Substituting the values we get,
![A = 5000(1+(0.12)/(4))^(4 * 5)\\\\A = 5000(1+0.03)^(20)\\\\A = 5000 * 1.03^(20)\\\\A = 5000 * 1.806111\\\\A = 9030.5561](https://img.qammunity.org/2021/formulas/mathematics/middle-school/2zufqlz1nxbqmo20zto9dtavu08v91ex6h.png)
Thus amount earned after 5 years is $ 9030.5561