2(a). Stephen likes eating ice-cream very much.Below is the marginal benefit (MB) Stephen will derive from the consumption of an additional n-th unit of ice-cream.

nMB ($)

158

245

334

426

514

65

From this information, we can compute that the total benefit from the consumption of 4 units of ice-cream is[Answer]dollars.

(In decimal numbers, with two decimal places, please.)

(b). From the above information, we can compute that the average benefit from the consumption of 4 units of ice-cream is[Answer]dollars per unit.

(In decimal numbers, with two decimal places, please.)