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21 August, 18:32

A water district has been charging its customers a flat rate of $3.25 per HCF. Because of a drought emergency, it is instituting a block rate of $3.60 for the first 20 HCF and $4.85 for the next 40 HCF. If a family uses an average of 56 HCF per month, by what percent would their average bill increase under the block system?

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  1. 21 August, 19:36
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    Step-by-step explanation:

    The water district has been charging its customers a flat rate of $3.25 per HCF. If a family uses an average of 56 HCF per month, the total charge would be

    3.25 * 56 = $182

    Because of a drought emergency, it is instituting a block rate of $3.60 for the first 20 HCF and $4.85 for the next 40 HCF. If a family uses an average of 56 HCF per month, the total charge would be

    (3.6 * 20) + 4.85 (56 - 20)

    = 72 + 174.6

    = $246.6

    The increase in the charge is

    246.6 - 182 = $64.6

    The percent by which their average bill increased under the block system is

    64.6/182 * 100 = 35.5%
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