Solve
-A Common Equation Used in Business Is a Demand $p = - x ^ { 2 } + 108$

Multiple Choice

Solve.
-A common equation used in business is a demand equation. It expresses the relationship between the unit price of some commodity and the quantity demanded. In the demand equation $p = - x ^ { 2 } + 108$ , for a certain style of calculator, $p$ is the price per calculator in dollars and $x$ is the quantity demanded in thousands. Find the demand for the calculator if the price is $\$ 8$ per calculator.

A) 44 thousand units
B) 11 thousand units
C) 50 thousand units
D) 10 thousand units