An electric company calculates a person's monthly bill from the number of kilowatt-hours (kWh), [tex]x[/tex], used.
The function [tex]b(x) = \left\{ \begin{array}{cl}
0.10 x, & x \leq 200 \\
0.15(x - 200) + 20, & x \ \textgreater \ 200
\end{array} \right.[/tex] determines the bill.
How much is the bill for a person who uses [tex]800 \text{kWh}[/tex] in a month?
A. [tex]\$80[/tex]
B. [tex]\$60[/tex]