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21 August, 22:11

The cost of electricity in a certain city is $0.08 for each of the first 300kWh (kilowatt-hours) and $0.13 for each kilowatt-hour over 300kWh. Find the number of kilowatt-hours used by a family with a $51.95 electric bill.

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  1. 22 August, 00:30
    0
    515

    Step-by-step explanation:

    0.08*300 = 24

    24 + 0.13 (x-300) = 51.95

    0.13 (x-300) = 27.95

    x-300 = 215

    x = 515 kWhours
  2. 22 August, 00:31
    0
    Step-by-step explanation:

    0.08*300 + 0.13x = 51.95

    Multiply thru by 100 to get:

    8*300 + 13x = 5195

    13x = 5195-2400

    13x = 2,795

    x = 215 hours
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