Answer:
$9,000,000
Step-by-step explanation:
The computation of the depletion expense for the current year is shown below:
Depletion rate per unit is
= Acquired mineral rights ÷ Estimated mineral deposit
= $67,500,000 ÷ 30,000,000 tons
= $2.25 per ton
If the 4,000,000 tons were mined and sold, so the depletion expense is
= $2.25 × 4,000,000 tons
= $9,000,000