You are using the wrong units units for power and energy. Neither "kw/h" or "$ per kw" make any sense in the places you put them. I think you mean "kw" and "$ p

You are using the wrong units units for power and energy. Neither "kw/h" or "$ per kw" make any sense in the places you put them. I think you mean "kw" and "$ per kwh" respectively. kw=kilowatt, a unit of power; kwh=kilowatt-hour, a unit of energy Electricity is billed per unit of energy.