Maths-
General
Easy

Question

An electric company charges Jerome $0.05 per kilowatt-hour (kWh) of energy he uses in his house. If Jerome was charged $36 by the electric company, how many kilowatt-hours of energy did Jerome use?

  1. 0.0014
  2. 1.8
  3. 180
  4. 720

The correct answer is: 720


    Step by step explanation:
    Given:
    Charge for electricity per kilowatt-hour (kWh) = $0.05
    Total charge for electricity = $36
    Step 1.
    Let the energy used be x kWh.
    So, according to the given information,
    The charge for x kWh will be 0.05 × x = $0.05x
    Now, the total charge will be,
    ⇒ 0.05x
    Step 2.
    As, it is given that total charge is $36
    ∴ 0.05x = 36
    ⇒ 0.05x = 36
    Divide both side by 0.05
    Error converting from MathML to accessible text.
    ⇒ x = 720
    ⇒ x = 720
    Hence, the Jerome use 720 kilowatt-hours of energy.

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