Answer: See explanation
Explanation:
a. Determine the amount of depletion expense for the current year.
First, we've to calculate the depletion rate per unit which will be:
= $67,500,000 / 30,000,000
= $2.25
Then, the depletion expense will be:
= $2.25 × 4,000,000
= $9,000,000
b. Journalize the adjusting entry on December 31 to recognize the depletion expense.
Debit Depletion expense $9,000,000
Credit Accumulated depreciation $9,000,000
(Being depletion of 4,000,000 tons)