Suppose Skip's utility function is U = 3X + 7Y, where X is the consumption of HAMBURGERS and Y is the consumption of FRENCH FRIES. For this utility function, the marginal utility of X is given by MUx = 3 and the marginal utility of Y is given by MUy = 7, and U is the total utility gained with consuming various combinations of hamburgers and French fries.
Suppose Y = 3. Show your formula, calculation, and answer for the following questions:
Skip's utility when X = 2
Skip's utility when X = 3
Skip's utility when X = 10
Skip's utility when X = 11
For the given level of Y, does good X display diminishing marginal utility? Justify your answer by calculating MU for each interval provided in the space to the right.
Please explain step by step?