The Total Revenue R Earned (In Thousands of Dollars) from Manufacturing

Multiple Choice

The total revenue R earned (in thousands of dollars) from manufacturing handheld video games is given by $R ( p ) = - 25 p ^ { 2 } + 1900 p$
Where p is the price per unit (in dollars) .

Find the unit price that will yield a maximum revenue.

A) $42.00
B) $40.00
C) $41.00
D) $39.00
E) $38.00