Question 1160346
A computer that was purchased for $1,200 is now worth $450. If it is depreciating at a rate of 9% per
year, how old is the computer?
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Each year, it's worth 91% of the previous year, = 0.91 times as much.
450 = 1200*(0.91)^y  ---- y = years
0.91^y = 450/1200 = 3/8
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y*log(0.91) = log(3/8)
y = log(0.375)/log(0.91)
y =~ 10.4 years