Precision 3390

The price of the device is reduced by one-fifth every year. How long before the price of the device drops to one-tenth of the price? Specify years and months with precision.

Correct answer:

r =  10.3189

Step-by-step explanation:

q=11/5=54=0.8 qr = 0.10 r ln q = ln 0.10 r=ln0.10/lnq=ln0.10/ln0.8=10.3189



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