Assume that an individual consumes two goods, X and Y. The total utility of each good is independent of the rate of consumption of the other good.

The price of X and Y are $40 and $60 respectively. Use the following table of total utilities to answer the following questions.

Good Total Utility of X Total Utility of Y

1 20 45

2 38 78

3 54 108

4 68 135

5 80 159

6 90 180

a. The marginal utility of the fourth unit of Y is _.

b. The marginal utility of the fifth unit of X is _.

c. The marginal utility per dollar spent on the third unit of X is _.

d. The marginal utility per dollar spent on the second unit of Y is _.

e. If the consumer has $420 to spend, _ unit of X and _ units of Y maximize utility subject to the budget constraint. Explain.

f. If the consumer has $220 to spend, _ units of X and _ units of Y maximize utility subject to the budget constraint. Explain.