In order to calculate how much money Charlie will have after 7 months, let's first calculate the value he saved for the first 6 months, then we add the value for the last month.
For the first 6 months, he saves $23.45 each month, so the total is:
![6\cdot23.45=140.7](https://img.qammunity.org/2023/formulas/mathematics/college/82d9aaetbacib59uh61jopqt0q7kh99gfs.png)
Now, adding the value of the last month:
![140.7+10.2=150.9](https://img.qammunity.org/2023/formulas/mathematics/college/9vb6agv3y2t521r4p1zg804mwhf22thu28.png)
So Charlie saved a total of $150.90.