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20 January, 14:23

A firm decides to increase output at a constant relative rate from its current level of 20,000 to 30,000 units during the next five years. calculate the annual percent rate of increase required to achieve this growth.

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  1. 20 January, 17:05
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    8.45%

    Here's we're looking for a geometric increase from 20,000 to 30,000 over a period of 5 years. So the equation is

    20000*X*X*X*X*X = 30000

    20000*X^5 = 30000

    X^5 = 30000/20000

    X^5 = 1.5

    So we need the 5th root of 1.5. We can do that using logarithms.

    10^ (log (1.5) / 5)

    = 10^ (0.176091259/5)

    = 10^0.035218252

    = 1.084471771

    So 1.084471771^5 = 1.5

    Since we're looking at the percentage increase and 1 = 100%, we can just subtract the 1 and get 0.084471771 which is 8.4471771% or a 8.45% annual growth rate.
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