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Math Help - Percentage question #4.

  1. #1
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    Exclamation Percentage question #4.

    In the first 3 monthsof a year, Sally spent 72% of her salary. In the next 4 months, she increased her savings by 25%. If Sally earned the same salary of $1800 per month, what is her average monthly expenditure for the 7 months?
    Last edited by mr fantastic; June 7th 2010 at 05:42 AM. Reason: Re-titled.
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  2. #2
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    In the first 3 months, expenditure is 72%.
    => in the first 3 months her saving is (100-72)% = 28%.

    In next 4 month, she increased her saving by 25%
    which is equal to (28 + 28*25/100)% = 35%

    There forre in next four months her expenditure is (100-35)% = 65 %.

    There for the % average expenditure in 7 months = (72.3+65.4)/7 %
    = 476/7 = 68%

    Her average expenditure = $(1800 . 68)/100 = $1224
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  3. #3
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    Hello and thanks :D

    Hi. Thank you very much ! I greatly appreciate your help
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