The management of Ditton Industries has determined that the daily marginal revenue function associated with selling x units of their deluxe toaster ovens is given by the following, where

R '(x) is measured in dollars/unit.

(a) Find the daily total revenue realized from the sale of 180 units of the toaster oven.
$ ?

(b) Find the additional revenue realized when the production (and sales) level is increased from 180 to 280 units.
$ ?