ok, so per month+comission+reimgurssement=total
we jsut want the comission
so total-permonth-reimbursement=comission=256.65-240-8.95=7.7
she made 7.7 comission
$7.70 is 5% of her salse
find 100%
remember that x%=x/100
hmm
7.7 is 5% of total sales
7.7=5/100 of total sales
tiems both sides by 100/5
770/5=total sales
154=total sales
her total sales was $154
ok, you want an equation?
256.65=240+0.05s+8.95 where s is her total sales
