The Profit (In Dollars) from Selling X Units of Calculus $p = - 0.05 x ^ { 2 } + 20 x - 1000$

Multiple Choice

The profit (in dollars) from selling x units of calculus textbooks is given by $p = - 0.05 x ^ { 2 } + 20 x - 1000$ . Find the marginal profit when $x = 149$ . Round your answer to two decimal places.

A) $34.90
B) $869.95
C) $5.10
D) $20.00
E) $864.80