The Relationship Between the Number of Calculators a Company Sells

The relationship between the number of calculators a company sells per week, x , and the price p of each calculator is given by the equation . At what price should the calculators be sold if the weekly revenue is to be ? ( Hint : The equation for revenue is .)

A) $2
B) $2 and $5
C) $7
D) $2 and $7
E) $7 and $10