Answer:
$288,000
Step-by-step explanation:
Cost = $1,800,000 ($1,400,000+$400,000)
Salvage value = $200,000
Amount subject to depletion = Cost - Salvage value
Amount subject to depletion = $1,800,000 - $200,000
Amount subject to depletion = $1,600,000
Total units of capacity = 1,000,000 tons
Depletion per unit = Amount subject to depletion / Total units of capacity
Depletion per unit = $1,600,000 / 1,000,000 tons
Depletion per unit = $1.6 per unit
Units extracted and sold in period = 180,000 tons
Depletion expense = Units extracted and sold in period * Depletion per unit
Depletion expense = 180,000 tons * $1.6 per unit
Depletion expense = $288,000