Which one of the following depreciation methods is most suitable for a coal mine?
If a mine has 2 lakh tons of coal and the value of mine is Rs. 5 lakhs, each ton of coal will cost Rs. 2½. The quantity of coal taken out of the mine in a period will be multiplied by the rate per ton, i.e., Rs. 2½ and the resultant figure will be the amount of depreciation.