A gardener has the task of digging an area of 800 metres per square. On the first day he digs an area of 10 metres per square. On each successive day he digs an area of 1.2 times the area that he dug the previous day, until the day when the task is completed. Find the number of days needed to complete the task.

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  1. you have a GP with
    a = 10
    r = 1.2
    So you want
    10(1.2^n - 1)/(1.2 - 1) >= 800

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  2. Bsnsn

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