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I need to find when a phone will be worth $200 when it is currently $649.82 that depreciates in value at the rate of 63% each year.

 Dec 6, 2018
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Value = 649.82 (1-.63)^t

   200 = 649.82 (1-.63)^t

200/649.82 = (.37)^t

.3077 = .37^t

log .3077 / log.37 = t=1.19 yrs      1 yr 68 days

 Dec 6, 2018
edited by Guest  Dec 6, 2018

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