The following table reflects John's units and marginal utilities of consuming gasoline, clothing, and food. Assume that the price of gasoline is $18, the price of clothing is $6, and the price of food is $4. John's income is $102

Units of gasoline	MU of gasoline	Units of clothing	MU of clothing	Units of food	MU of food
1	72	1	24	1	15
2	54	2	15	2	12
3	45	3	12	3	8
4	36	4	9	4	7
5	27	5	7	5	5
6	18	6	5	6	4
7	15	7	2	7	3.5
8	12	8	1	8	3

a)Calculate the total utility for each item consumed.

b)What units of gasoline, clothing, and food that should be consumed to maximize John's utility? Explain.