Provide an Appropriate Response $\mathrm { x }$ Is the Number of Desks Manufactured

Provide an appropriate response.
-For a certain computer desk, the manufacturing cost C per desk (in dollars) is

where $\mathrm { x }$ is the number of desks manufactured.
a. Find the average cost per desk when manufacturing 200 desks.
b. Find the average cost per desk when manufacturing 1000 desks.

A) a. $\$ 220$ ; b. $\$ 204$
B) a. $\$ 180$ ; b. $\$ 196$
C) a. $\$ 240$ ; b. $\$ 220$
D) a. $\$ 40 ;$ b. $\$ 24$