Profit Suppose That the Monthly Revenue and Cost (In Dollars) $R = 200 x - \frac { x ^ { 2 } } { 10 } \text { and } C = 6000 + 10 x$

Multiple Choice

Profit. Suppose that the monthly revenue and cost (in dollars) for x units of a product are $R = 200 x - \frac { x ^ { 2 } } { 10 } \text { and } C = 6000 + 10 x$ At what rate per month is the profit changing if the number of units produced and sold is 100 and is increasing at a rate of 10 units per month?

A) $\$ 18,800$ per month
B) $\$ 1700$ per month
C) $\$ 1800$ per month
D) $\$ - 100$ per month
E) $\$ 19,800$ per month