Answer:
Roger needs to sell 16 pairs of shoes.
Explanation:
Given : Roger gets $40 per day as wages and $4.50 as a commission for every pair of shoes he sells in a day. His daily earnings goal is $112.
To find : Write an equation to determine how many pairs of shoes, p, Roger must sell in a day to meet his daily earnings goal ?
Solution :
Let the number of pairs of shoes be p.
$4.50 as a commission for every pair of shoes he sells in a day i.e. 4.5p.
According to question,
![112 = 4.5p+40](https://img.qammunity.org/2021/formulas/mathematics/middle-school/hfwazv0s8k79kfho0z9frymcy9thbp4kiq.png)
i.e. the daily earning goal is equal to the wage per day plus the number of shoes multiplied by the commission for each pair.
Solving the equation,
![4.5x=112-40](https://img.qammunity.org/2021/formulas/mathematics/middle-school/whd78hb9ew8l8flnmm3pwo9jxzlia7x0ry.png)
![4.5x=72](https://img.qammunity.org/2021/formulas/mathematics/middle-school/g3ynugr76dadd8nddfcc0vumh3u06dwlg8.png)
![x=(72)/(4.5)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/qt0yu8yunphoazvd16udck8qc270aj1x1h.png)
![x=16](https://img.qammunity.org/2021/formulas/mathematics/high-school/z825gvkr7rltixy7d501bd46flsu11ruw0.png)
Therefore, Roger needs to sell 16 pairs of shoes.