Question

A machine depreciates every year at the rate of 20% of its value at the beginning of the year. The machine was purchased for Rs.250000 when new and the scrap value realised when sold was Rs. 128000. Find the number of years that the machine was used.

Answer 1

let the no. of year machine used be x

1. then, 80%of x = 250000
2. 80/100 × X = 250000
3. 4/5× X = 250000
4. X= 62500× 5