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Susie purchased a laptop computer for $2000 at the beginning of the year in 2008,the value of the computer decreased by 20% each year. Susie wants to purchase a new laptop computer when the value of hers falls below $500. When will Susie be able to purchase a new laptop?
12 years ago

Answers

Reiny
so you are solving

2000(.8)^n = 500
.8^n = 500/2000 = .25
take log of both sides

log .8^n = log .25
n log .8 = log .25
n = log .25/log .8 = appr 6.2 years
12 years ago

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