The following are the total utilities of commodities x and y:

Q TUx TUy 1 30 20 2 55 38 3 75 54 4 90 68 5 100 80

(a) Find the marginal utilities of both commodities.

(b) Draw the total utility and marginal utility curves for both commodities separately.

(c) Find the consumer’s optimal combination choice if Px = $5.00 and Py = $4.00.

(d) Find the necessary consumer budget required to purchase the optimal choice.