The total charge on your electricity bill is determined by the amount of electricity that has been consumed. However, many municipalities have on$-$peak and off$-$peak rates in order to encourage consumers to use less electricity during business hours, when demand on the grid is higher. Consider a region where on$-$peak rates are $$0\mathrm{.}25/$kWh and off$-$peak rates are $$0\mathrm{.}10/$kWh$.$ The charge for being connected to the grid is a flat fee of $$5\mathrm{.}00.$