Refer to the following table that gives the demand facing a monopolist:

Refer to the following table that gives the demand facing a monopolist:

Price	Quantity
$20	20
15	40
10	65
5	70

How much does the 28th unit of output add to total revenue?

Answer Options are $20, $10, $2, $200, or None of these

it is ASKING TOTAL REVENUE.