To find the useful life of the car, we need to determine the rate of depreciation and then use it to calculate the total years required for depreciation. Given:
- Original cost of the car = ₹8,00,000
- Scrap value of the car = ₹3,00,000
- Book value at the end of 4th year = ₹6,00,000
First, calculate the annual depreciation:
Annual depreciation = (Initial cost - Book value after 4 years) / 4 = (₹8,00,000 - ₹6,00,000) / 4 = ₹50,000 per year
Using this rate, calculate the total years needed to reduce the value to the scrap value:
Useful life = (Initial cost - Scrap value) / Annual depreciation = (₹8,00,000 - ₹3,00,000) / ₹50,000 = 10 years
Thus, the useful life of the car is 10 years.