In the year 2000 there were 350 mobile phones users living in the small town of Phoneville. Since 2000 the number of residents using mobile phones has increased by 25% each year, that is, each year the number of mobile phones increases by a factor of 1.25
Calculate, to three significant figures, the number of mobile phone users after 19 years. You may find it useful to first devise a formula for the number of mobile phone users after n years.

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  1. number of mobile phones
    = 350(1.25)^19 = 24 286.13

    I thought Phoneville was a small town?

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  2. Thanks! I've no idea, i thought my answr was too far off but I was using the wrong formula. Thanks!

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