The amount of revenue a company makes per day by selling $x$ items is given by the function $f ( x ) = 14 x - 0.2 x ^ { 2 }$. How many items should be sold if the company wants to maximize their profit?
A) 40 items
B) 35 items
C) 30 items
D) 70 items

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The Answer of The amount of revenue a company makes per day by selling $x$ items is given by the function $f ( x ) = 14 x - 0.2 x ^ { 2 }$. How many items should be sold if the company wants to maximize their profit?
A) 40 items
B) 35 items
C) 30 items
D) 70 items

The Amount of Revenue a Company Makes Per Day by Selling