Final answer:
The total utility when two units are consumed is the sum of the total utility of the first unit and the marginal utility of the second unit, which equals 24.
Step-by-step explanation:
The question deals with the concepts of total utility and marginal utility, which are key ideas in microeconomics specifically within the study of consumer behavior. The student is asked to calculate total utility after consuming two units.
Given that the total utility of the first unit is 15 and the marginal utility of the second unit is 9, the total utility for two units would be the sum of the utility of the first unit plus the marginal utility of the second unit. Therefore, the total utility when two units are consumed is 15 (first unit) + 9 (second unit) = 24.
The total utility when two units are consumed can be calculated by adding the total utility of the first unit with the marginal utility of the second unit. In this case, the total utility of the first unit is 15 and the marginal utility of the second unit is 9.
Therefore, the total utility when two units are consumed is 15 + 9 = 24.