Question

A two wheeler depreciates at 20 % of its value every year.
If present value of the same be 90000, its depreciated
value would be 36864 after how many years?
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Answer 1

Answer:

36864=90000(1-20/100)^n

where n is the number of years in which depreciated value has become 36864

(36864/90000)=(1-0.2)^n

(0.4096)=(0.8)^n

(0.8)^4=(0.8)^n

n=4

Ans 4 years