One pie costs $4 for a piece. Each pie is having 3 pieces. During one hour the bakery can make 12 pies. Creating one pie costs the bakery $0.5. Considering the bakery would be able to sell all pie pieces, how much money would it make? Think carefully first, then make a decision:
If the bakery can make 12 pies, this means there would be 12 * 3 = 36 pie pieces. For all the pieces the bakery would make 36 * 4 = $144. The cost of making 12 pies is 12 * 0.5 = $6. That means the bakery would make 144 - 6 = $138. So, the answer is 138.