Question

a machine depreciation by 10%. it was bought before 3 yrs and the current value is rs 8748 . calculate its purchase price

Answer 1

Let x be the purchase price 3 years ago.

Over the three year span, the machine lost 10% per year of it purchase price. That means that the machine kept 90% of its value the previous year.

8748 = x * (.90)^3

You can crank that out by hand and solve for x.

Or, you can use an online algebra calculator. If you use it, scroll down and look for solution.

http://www.wolframalpha.com/input/?i=8748%3D+x*+%28.9%29%5E3

@sheru

Answer 2

is there any specific formula for that kind of problems

Answer 3

Exponential Growth and Decay

http://www.regentsprep.org/regents/math/algebra/ae7/expdecayl.htm

Answer 4

thank u

Answer 5

You are welcome.