To determine how much she will have in her account after 4 years you have to calculate the simple interest using the following formula:
[tex]A=P\mleft(1+rt\mright)[/tex]Where
A: total amount accured
P: principal investment
r: interest rate → you have to express it as a decimal number not as a percentage
t: time of the invesment → normally expressed in years
For
P= $17.250
r=11%→ 11/100=0.11
t=4years
The simple interest will be
[tex]\begin{gathered} A=17250(1+0.11\cdot4) \\ A=17250(1+0.44) \\ A=17250\cdot1.44 \\ A=24840 \end{gathered}[/tex]