question: Tara bought 8 packs of 5 canvas bags for $4 each. She painted them and sold them at a craft fair for $8 each. How much profit did she earn on her bags?
answer: The total number of bags is 8*5 = <<8*5=40>>40
  The cost of the 40 bags is 40*4 = <<40*4=160>>160
  Tara sold the 40 bags at 8 each earning her 40*8 = <<40*8=320>>320
  Her profit was 320-160 = <<320-160=160>>160
  #### 160