Suppose that a monopoly computer chip maker increases production from 10 microchips to 11 microchips. If the market price declines from $30 per unit to $29 per unit, marginal revenue for the eleventh unit is:

$19

Explanation:

Marginal revenue is the change in revenue when production increases by one unit

Marginal revenue = change in total revenue / change in quantity produced

total revenue 1 = $30 x 10 = $300

Total revenue 2 = $29 x 11 = $319

change in total revenue = $319 - $3000 = $19

Change in quantity produced = 11 - 10 = 1

Marginal revenue = $19 / 1 = 19

there's 11 people for the 1st position. then, no matter who gets it, there's only 10 left for the second, and then 9 left for the third. 11 x 10 x 9 = 990.   the answer is there are 990 different ways the positions can be filled by these applicants