$2,000 = 20 $100 dollar bills 20 (hundred dollar bills)*10 (months) = 200 $100 dollar bills 2,300-2,000 =3(hundred dollar bills)*10(months) = 30 $100 dollar bills 200+30 =230 The answer is, Cameron will need 230 $100 dollar bills to pay his rent for ten months. Hope this helps