Ijust need with #16 . photomath said the answer was pi but i don’t understand the explanation they gave. i got 0 when i changed it into sin/cos but i get the feeling that 0 is not the correct answer.

Roger gets \$40 per day as wages and $4.50 as commission for every pair of shoes he sells in a day. his daily earnings goal is $112 write an equation to determine how many pairs of shoes, p, roger must sell in a day to meet his daily earnings goal. find the number of pairs of shoes he must sell to meet his daily earnings goal.