Answer: There is difference of $660 in their paychecks.
Explanation:
Since we have given that
Number of hours in one week they worked = 40
Amount of sales = $78000
Kent makes $10 per hour plus 3% on the amount of sales .
So, the equation for Kent becomes,
![10* 40+(3)/(100)* 78000\\\\=400+3* 780\\\\=400+2340\\\\=\$2740](https://img.qammunity.org/2020/formulas/mathematics/middle-school/pnay8q13zj2osr573dbecu7dydo1jlztvk.png)
Similarly, Bradley only makes $7 per hour but he makes 4% on the amount of his sales .
So, the equation for Bradley becomes,
![7* 40+(4)/(100)* 78000\\\\=280+4* 780\\\\=280+3120\\\\=\$3400](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5jycgbgluzregdbn2vbaqqdrxi3pnzinq0.png)
hence, the difference between of their paychecks is given by
![\$3400-\$2740\\\\=\$660](https://img.qammunity.org/2020/formulas/mathematics/middle-school/8fjw2elfophfg1w3yyns4s5n9tb7xaiba0.png)
Therefore, there is difference of $660 in their paychecks.