Answer:
The answer is: The depletion is $17.70 per unit.
Explanation:
We have the depletion per unit is calculated as below:
Depletion per unit = ( Machine cost - Residual value at the end of useful life ) / Expected capacity;
So, apply in to the question we have:
Depletion per unit = ( Cost of coal machine - Residual value) / Expected tons of coal hold = ( 1,009,000 - 0) / 57,000 = 1,009,000 / 57,000 = $17.70 per unit ( round to the nearest cent).
Thus, the depletion is $17.70 per unit.