Water bill of Simons in the month of August = $48 Percentage of bill that was lower in the month of September = 15% then Amount of bill that was lower in the month of September = (15/100) * 48 = 720/100 dollars = 7.2 dollars So The bill for the month of September = (48 - 7.2) dollars = 40.8 dollars So Simon will have to pay $40.8 as the water bill for the month of September. I hope the procedure is clear enough for you to understand.
