maths

A man spends 80% of his income. His income increased by 25% and his expenditure increased by 10%. By how much did his savings increase?

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  1. plz plz answer i am in a true need of it!!!!

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  2. To make it easier to see, let's say his income is $1000
    so he spends $800 and saves $200

    his new income = 1.25(1000) = 1250
    his new spending = 1.1(800) = 880
    new savings = 1250-880 = 370
    increase in savings = 370-200 = 170

    increase in savings = 170/200 = .85 or 85%

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    posted by Reiny
  3. now he makes 100, spends 80, and saves 20
    later, he makes 125 and spends 88, saving 37

    so, his savings went up 17/20 = 85%

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    posted by Steve
  4. thank you reiny and steve but in both case i couldn't understand a similar step:
    1)In reiny's answer :his new spending = 1.1(800) = 880 from where 1.1 came from?

    2)in steve's answer :spends 88 ,from where 88 came from ?

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  5. 80% increased by 10% is .80*1.1 = .88

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    posted by Steve

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