Question

Sam paid $8.28 for 18 stamps.at this rate,how much will he pay to buy 12 stamps

Answer 1

HE WOULD PAY $5.52 FOR 12 STAMPS BECAUSE 8.28/18=0.46 THE YOU USE 0.46 X 12 = AND GET $5.52

Answer 2

lets find the cost per stamp by dividing the cost by # of stamps
$8.28/18 
=$0.46
so if that is the cost per stamp, multiply that by 12 to find the new total cost 
0.46x12
=5.52