Final answer:
The situations with a net sum of 0 are when the apple and orange both cost $0.50, the carpenter makes the same amount of benches that she sells, and a business's income is twice as much as its expenses.
Step-by-step explanation:
The situations that have a net sum of 0 are:
- A. An apple and an orange both cost $0.50: When the cost of the apple and the orange are both $0.50, the total cost is $1. Since it's the same amount spent, there is no net sum.
- C. A carpenter makes the same amount of benches that she sells: If the carpenter makes and sells the same number of benches, the total count of benches remains unchanged, resulting in a net sum of 0.
- D. A business's income is twice as much as the business's expenses: When the income of a business is twice as much as its expenses, both amounts cancel each other out, resulting in a net sum of 0.