Answer:
a.
![115+1,565x=240.20](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6lt22e28qbluisg0qdzgva97nvc4pk4vrd.png)
b.
![8\%](https://img.qammunity.org/2020/formulas/mathematics/middle-school/nt6a2e8r9gshtz8tb0tqy8najzjm398g1p.png)
Explanation:
a. According to the information given in the exercise, you know that the sale person's daily earnings is the sum of $115 plus a commission of his daily sales.
Therefore, if his daily sales are $1,565, then his comission is given by:
![1,565x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/a1fwdfbxkrt62xgpex1eifco8tuxjbbev6.png)
Knowing that his total earnings for that day are $240.20, you can write the following equation which can be used to find "x":
![115+1,565x=240.20](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6lt22e28qbluisg0qdzgva97nvc4pk4vrd.png)
b. In order to find the commision percent (in decimal form) of the sale person's daily sales, you must solve for "x":
![115+1,565x=240.20\\\\1,565x=240.20-115\\\\x=(125.2)/(1,565)\\\\x=0.08](https://img.qammunity.org/2020/formulas/mathematics/middle-school/o3epo5znik2u1d02fymifexs49bly2t48f.png)
Multiplying it by 100, you get it in percent form:
![=0.08*100=8\%](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5lsrjtz8qjooqkovmsa922j2f48cz33uwk.png)