Alaptop computer is purchased for $4500. each year, its value is 80% of its value the year before. after how many years will the laptop computer be worth $1000 or less?

So after 7 year price of the laptop will be less than $1000

Step-by-step explanation:

We have given price of the laptop is $4500

Its price is 80% of if its value in every next year

So depreciation rate = 100 - 80 =20%

For depreciation we know that

Here V is final value and P is present value

So

Taking log both side

n = 6.74

So after 6.74 year the price of the laptop will be less than $1000