The Unit Selling Price P (In Dollars) and the Quantity

Multiple Choice

The unit selling price p (in dollars) and the quantity demanded (in pairs) of a certain brand of women's gloves is given by the demand equation . What is the marginal revenue to the nearest cent per day when x = 10?

A) The marginal revenue when x = 10 is $160 per day.
B) The marginal revenue when x = 10 is $147.41 per day.
C) The marginal revenue when x = 10 is $0.99 per day.
D) The marginal revenue when x = 10 is $158.41 per day.