The energy cost per day in Peso is equal to the energy consumption E in kWh per day times the energy cost of 1 kWh in Peso/kWh:
Cost(P/day) = E(kWh/day) × Cost(P/kWh)
The energy E in kilowatt-hours (kWh) per day is equal to the power P in watts (W) times number of usage hours per day t divided by 1000 watts per kilowatt:
E(kWh/day) = P(W) × t(h/day) / 1000(W/kW)
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