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Kamau bought a car for 1.2 million, which depreciated at a constant rate of 9.5% per annum. After a while, he sold it to a second car dealer for 900,000. How long did he keep the vehicle?

Answer :

He stayed with the vehicle which he bought for 1.2 M and sold for 900,000 for 2.87 years

The principal amount of car = 1.2 M

Rate of depreciation = 9.5 % per annum

Amount in which he sold the car to the dealer = 900000

using formula

A = P (1 - R)ˣ

A = 900000

P = 1.2 million

R = 0.095

x = time

900000 = 1200000 ( 1 - 0.095 )ˣ

9/12 = (0.905)ˣ

0.75 = (0.905)ˣ

Taking logs on both sides

log 0.75 = x log 0.905

-0.287 = x (- 0.0998)

x = 2.87

He stayed with the vehicle for 2.87 years

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