Kilowatt-hours

Question

The cost of electricity in a certain city is $.08 for each of the first 300kWh (kilowatt-hours) and $.13 for each kWh over 300 kWh. Find the number of kilowatt-hours used by a family that receives a $51.95 electric bill.

Answer 1

.08(300) = $24 for the first 300 kWh

 

that leaves 51.95-24 = 27.95 for the rest of the bill at $.13 per kWh

 

27.95/.13 = 215 kWh after the initial 300 kWh

 

Total kWh = 300 + 215 = 515 kWh total