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
