In order to calculate simple interest, we can use the following formula:
![P=P_0+P_0\cdot i\cdot t](https://img.qammunity.org/2023/formulas/mathematics/college/dng1n796p5p3j0ruwg6lx75jg8fjzoijlx.png)
Where P is the final value, P0 is the initial value, i is the interest and t is the amount of time.
Using P0 = 2300, i = 7% = 0.07 and t = 4, we have:
![\begin{gathered} P=2300+2300\cdot0.07\cdot4 \\ P=2300+2300\cdot0.28 \\ P=2300+644 \\ P=2944 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/3igzekkrulzwcoh2gupzm845i03to10vxh.png)
So Michelle will have $2944 in her savings account after four years.