Respuesta :

$0.080 per kWh

25W porch light

a day = 24hrs

365 days in a year = 8760hrs


1) convert 25W to kW

0.025kW in the porch light



2) kW in a year

0.025kW × 8760hrs = 219 kWh in a whole year



3) money

$0.080 × 219kWh = $17.52