In This Problem, Cost, Revenue, and Profit Are in Dollars

In this problem, cost, revenue, and profit are in dollars and x is the number of units. Suppose that the total revenue function is given by , and that the total cost function is given by . Find , and explain what this value represents. Round your answer to two decimal places. ​

A) 84.88. The sale of the 101st unit will increase profit by $84.88.
B) 84.88. The sale of the 101st unit will decrease profit by $84.88.
C) 84.75. The sale of the 101st unit will increase profit by $84.75.
D) 85.00. The sale of the 101st unit will increase profit by $85.00.
E) 85.00. The sale of the 101st unit will decrease profit by $85.00.