Rich bought 5 cupcakes and one pie. He know his total bill and know the pie was 6.88, but he wants to find the price if the cupcakes. How can he determine the price of each cupcake?

if there is no tax he can subtract 6.88 from the total bill and then divide the answer by 5 or use the following equation:

where t = total bill and c = cupcake

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.