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Thread: Question help

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    Cadet red152's Avatar
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    Question help

    A bacteria colony is growing at a rate of 20% per hour. If there are 10 000 bacteria now, use the compound interest formula to calculate how many there will be after 1 day. (Give your answer correct to the nearest 10 000.)

    Thx in advance

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    Senior Member integral95's Avatar
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    Re: Question help

    “Smart people learn from their mistakes. But the real sharp ones learn from the mistakes of others.”
    ― Brandon Mull

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    Junior Member Sp3ctre's Avatar
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    Re: Question help

    As the question says, use the compound interest formula: A = P(1+r)^n

    In this case, P = 10 000, r = 20% per hour = 0.2 per hour, n = 1 day = 24 hours

    Number of bacteria
    = 10 000(1+0.2)^24
    = 794968.472
    = 790000 (to the nearest 10000)
    HSC 2017: English Adv - Maths Ext 1 - Maths Ext 2 - Chemistry - Physics
    ATAR Aim: 97.30

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