Answer: See explanation
Step-by-step explanation:
Following the information given in the question, the adjusting journal entry to record depletion expense will be:
Debit Depletion expense - Coal deposit = $280,000
Credit Accumulated Depletion - Coal Deposit = $280,000
Note that the depletion expense was calculated as:
= ($900000 - $100000) / 200000] × 70000
= $280000