Tax Revenue Economist Arthur Laffer has been a center of controversy because of his Laffer curve, an idealized version of which is shown here.
According to this curve, increasing a tax rate, say from $x_{1}$ percent to $x_{2}$ percent on the graph, can actually lead to a decrease in government revenue. All economists agree on the endpoints, 0 revenue at tax rates of both $0 \%$ and $100 \%,$ but there is much disagreement on the location of the rate $x_{1}$ that produces maximum revenue. Suppose an economist studying the Laffer curve produces the rational function
$$
R(x)=\frac{80 x-8000}{x-110}
$$
where $R(x)$ is government revenue in tens of millions of dollars for a tax rate of $x$ percent, with the function valid for $55 \leq x \leq 100$. Find the revenue for the following tax rates. Round to the nearest tenth if necessary.
(a) $55 \%$
(b) $60 \%$
(c) $70 \%$
(d) $90 \%$
(e) $100 \%$
(GRAPH CANT COPY)