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find p from the formula I=prt/100 when i=20, r=5 and t=4

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    I=prt/100

    20 = (p * 5 * 4) / 100
    20 = 20p / 100
    20 * 100 = 20p
    2,000 = 20p
    2,000/20 = p
    100 = p

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