The Demand Equation for a Product Is $p = 40 - 0.0008 x$

Multiple Choice

The demand equation for a product is $p = 40 - 0.0008 x$ where $p$ is the price per unit and $x$ is the number of units sold. The total revenue $R$ for selling $x$ units is given by $R = x p.$ How many units must be sold to produce a revenue of $200,000?

A) 5635 units or 54,580 units
B) 44,365 units or 74,090 units
C) 4580 units or 74,090 units
D) 5635 units or 44,365 units
E) 5635 units or 74,090 units