The Total Revenue R Earned (In Thousands of Dollars)from Manufacturing $R ( p ) = - 25 p ^ { 2 } + 1900 p$

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) .
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Find the unit price that will yield a maximum revenue.
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A) $42.00
B) $40.00
C) $41.00
D) $39.00
E) $38.00