Final answer:
The principle of contribution is illustrated in situation 4, where a homeowner adds a third bathroom to a house and thereby increases the appraised value by $10,000.
Step-by-step explanation:
The principle of contribution is illustrated in situation 4, where a homeowner adds a third bathroom to a house and thereby increases the appraised value by $10,000. In this case, the additional bathroom contributes to the overall value of the house.
Contribution refers to how a specific improvement or feature adds value to the property as a whole. By adding a third bathroom, the homeowner has increased the functionality and desirability of the house, leading to a higher appraised value.