08-05-2017
Mathematics

contestada

The value of a dirt bike decreases by 30% each year. If you purchased this dirt bike today for $500, to the nearest dollar how much would the bike be worth 5 years later?

Respuesta :

08-05-2017

This is exponential decay of the form:

f=ir^t, f=final value, i=initial value, r=rate, t=time in this case:

f=500((100-30)/100)^t

f=500(0.7)^t so f(5) is

f(5)=500(0.7)^5

f(5)=$84.035

f(5)=$84.04 to nearest cent

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