There are 50 apple trees in an orchard. Each three produces 800 apples. For each additional tree...

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There are 50 apple trees in an orchard. Each three produces 800 apples. For each additional tree planted in the orchard, the output per additional tree drops by 10 apples. Number of trees that should be added to the existing orchard for maximizing the output of the trees, is
(a) 5
(b) 10
(c) 15
(d) 20
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