you have the equation, so just solve
120 + 0.15s = 277.50
0.15s = 157.50
s = 1050
"how much would a total sales"
is a rather strange way to ask the question.
Darla's weekly salary can be described as 120+0.15s where s represent her sales that week if she received $277.50 this week how much would a total sales
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