math

Mr chen deposits a certain amount in a bank if the interest of the bank decreased from 3.75% to 3.5% per annum mr chen's interest decrease by 50$ in a year find the sum of amount he deposits

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  1. Difference in interest rate
    =3.75%-3.5%
    =0.25%

    Difference in $
    = $50

    Use direct proportion
    0.25% : 50$
    100% : ?

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  2. 3.75 - 3.50 = 0.25

    I=PRT/100
    50=P x 0.25 x 1/100
    50= 0.25P/100
    cross multiplication
    5000=0.25P
    P= 5000/0.25
    P= 20000

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