To solve this problem, you should calculate the percentage he receives for the first ten suits by multiplying to figure out the total cost of the suits sold and then multiplying by his commission. Next, calculate the amount he receives for the remaining suits in the same way; and then use addition to calculate the total. In this case, Juan sold 10 $250 suits, which would be $2500. He received a 5% commission, which is $125.00. He sold 3 more suits for $250, which is $750. He received a 3% commission on this sale, so 22.50. If you add the two commissions together, Juan received $147.50 in total commissions this week.