question: Matthew has a collection of 12 unique toy soldiers. He wants to sell them for a fair price. He found a buyer who is willing to pay for half his collection $5 per toy, and for the other half $7 per toy. If Matthew would agree to that offer, how much money would he earn?
answer: Half of Matthew collection means 12 * 0.5 = <<12*0.5=6>>6 toy soldiers.
  A buyer wants to buy 6 toy soldiers for $5, so he would pay 6 * 5 = $<<6*5=30>>30 for them.
  And for the other half, he wants to pay $7 per toy, which would sum up to 6 * 7 = $<<6*7=42>>42.
  So if Matthew would agree to the buyer's offer, he would earn 30 + 42 = $<<30+42=72>>72.
  #### 72