Question $25(4$ points$)$

Only one firm produces and sells soccer balls in a country. The following equations describe the monopolist's demand and total cost.

Demand: $P=10-Q$

Total Cost: $TC=3+Q+0\mathrm{.}5Q^2$

where $Q$ is quantity and $P$ is the price measured in dollars. What is the monopolist's profit?

The monopolist's profit is $$12\mathrm{.}50.$

The monopolist's profit is $$10\mathrm{.}5.$

The monopolist's profit is $$8.$

The monopolist's profit is $$4.$