Total Revenue Is in Dollars and X Is the Number

Total revenue is in dollars and x is the number of units. Suppose that the total revenue function for a commodity is . Find , and explain what this value represents. Round your answer to two decimal places. ​

A) $18.30 is the marginal revenue from the 71st unit.
B) $17.60 is the marginal revenue from the 71st unit.
C) $1,281.00 is the marginal revenue from the 71st unit.
D) $1,298.59 is the actual revenue from the 71st unit.
E) $17.59 is the actual revenue from the 71st unit.