In order to determine how much Sharon's friend earnt in the same month, proceed as follow:
Calculate the 7% commision of $17,500:
![(7)/(100)\cdot17,500=1,225](https://img.qammunity.org/2023/formulas/mathematics/college/xtgq0u9cz5vcuuygef885o53n2kgaha5pr.png)
Now, consider that Sharon's friend has a fixed salary of $900. Then, the total amount of earnings of the month was:
$1,225 + $900 = $2,125
Hence, Sharon's friend earnt $2,125