B is incorrect. I only have one more shot to get it right. Please help (show steps)

l PRACTICEANOTHER I Marginal Revenue The management of Ditton Industries has determined that the daily marginal rev'enue function associated with selling x units of their deluxe toaster ovens Is given by the following, where R'(x) is measured in dollars/unit. R'(x) = 0.1x + 40 (a) Find the daily total revenue realized from the sale of 180 units of the toaster oven. $-~I (b) Find the additional revenue realized when the production (and sales) level is increased from 180 to 280 units. $ Need Help? Viewing Saved Work Revert to Last Response