Answer:
[tex]I=\$11,911.23[/tex]
Step-by-step explanation:
we know that  Â
The compound interest formula is equal to Â
[tex]A=P(1+\frac{r}{n})^{nt}[/tex] Â
where Â
A is the amount that she will repay Â
P is the amount borrowed Â
r is the rate of interest  in decimal
t is Number of Time Periods Â
n is the number of times interest is compounded per year
in this problem we have Â
[tex]t=20\ years\\ P=\$10,000\\ r=0.04\\n=1[/tex] Â
substitute in the formula above Â
[tex]A=10,000(1+\frac{0.04}{1})^{1*20}[/tex] Â
[tex]A=10,000(1.04)^{20}[/tex] Â
[tex]A=\$21,911.23[/tex] Â
Find out the interest
[tex]I=A-P[/tex]
substitute the values
[tex]I=\$21,911.23-\$10,000=\$11,911.23[/tex]