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Math Help - Average price of 1 Kw/h

  1. #1
    Newbie
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    Sep 2010
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    Average price of 1 Kw/h

    Hi all,

    a problem to solve:

    If for the first 20% of the time a kw/h costs 22.4p, then after that it only costs 9.8p per kw/h

    What is the average price of 1 kw/h? and how do you solve this?

    edit: this is to be worked out assuming the total kw/h used is 700.

    thanks,
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  2. #2
    Junior Member RHandford's Avatar
    Joined
    Sep 2010
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    N.E. Lincolnshire
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    70
    20% of 700 = 140
    So you have 140 Kw/h at 22.4p and 560 Kw/h at 9.8p
    or (140*22.4)+(560*9.8)=8624p or 86.24

    or do you want:

    86.24/700=12.32p Kw/h
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