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8 May, 23:15

They've invested to earn $20 in a savings account that offer 3% return on the investment the value of david's investment will be at least $400 after a period of

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  1. 8 May, 23:44
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    I=PRT

    P=present amount

    R=rate

    T=time

    basically

    20+interest is more than or equal to 400

    20+I>400

    minus 20 both sides

    I>380

    solve

    P=20

    R=3%=0.03

    T=?

    I=PRT

    380
    380<20 (0.03) (T)

    380<0.6T

    divide both sides by 0.6

    633.33333
    633.33 years at least
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