If 12 bumper stickers cost $8.64, then how much do 18 cost

In order to solve this problem, we must first find the GCF of 12 and 18. This would be six. Next, we would need to find out the value of six stickers. This can be done by halving the value of 12, as 6 is one-half of 12. 8.64/2 = $4.32, which is the cost of 6 stickers. Next, we need to multiply the cost of six stickers by 3 in order to get the cost of 18 stickers, because 18 is three times 6. 4.32 x 3 = $12.96. Therefore, the cost of 18 stickers is $12.96.

Hope this helps!