Salesman’s Commission

Ormond’s dad Luther sells solar panels. He receives a salary of $400 a week plus 1.2% commission on his sales. If his income last week was $1360, how much were his sales for the week?

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Let x represent Luther’s sales for the week. Then:

$400 + 0.012x  =  $1360
0.012x  =  $960
x  =  $960/0.012
x  =  $80,000

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