Answer:
$225,000
Step-by-step explanation:
Depletion rate = [Mine cost - Land value + Obligation to prepare the land for an alternative + Development cost] / Total number of ore extracted
Depletion rate = [$970,000 - $100,000 + $40,000 + $170,000] / $12,000,000
Depletion rate = $1,080,000/$12,000,000
Depletion rate = $0.09
Amount extracted in 2020 = Unit of ore extracted in 2020 / Depletion rate
Amount extracted in 2020 = 2,500,000 units * $0.09
Amount extracted in 2020 = $225,000