Creating a decision-making grid.
Problem: Sandy’s part-time job earns her only $25 income a week. This week her expenses are especially heavy. She wants to go to a rock concert, which will cost her $25. Her friend Rafael’s birthday is also this week, and the present she wants to buy him costs $25. In addition, Sandy’s car needs a brake repair, which costs $100. If Sandy pays for the first $25 of repairs, her dad will pay the remaining $75.