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19 February, 15:55

The population of a city in 2005 was 18,000. By 2010, the city's population had grown to 45,000. If the population growth follows a exponetial model, what is the projected population for 2015?

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  1. 19 February, 16:13
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    First find the rate of growth

    45000=18000 (1+r) ^ (2010-2005)

    Solve for r

    r = ((45,000:18,000) ^ (1:5) - 1) * 100

    R=20%

    Use it to find the population in 2015

    P=45000 (1+0.20) ^ (2015-2010)

    P==111,974.4
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