Question: Can you walk me through the solution of: 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 = 6 toy soldiers.
A buyer wants to buy 6 toy soldiers for $5, so he would pay 6 * 5 = $30 for them.
And for the other half, he wants to pay $7 per toy, which would sum up to 6 * 7 = $42.
So if Matthew would agree to the buyer's offer, he would earn 30 + 42 = $72.