A company that sells radios has a yearly fixed cost of $\$ 600,000 .$ It costs the company $\$ 45$ to produce each radio. Each radio will sell for $\$ 65$. The company's costs and revenue are modeled by the following functions:
$C(x)=600,000+45 x$ This function models "the company's costs. $R(x)=65 x$
This function models the company's revenue.
Find and interpret $(R-C)(20,000),(R-C)(30,000)$ and $(R-C)(40,000)$