Final answer:
The amount of depletion for 2014 can be calculated using the formula: Depletion per unit = (Total cost - Land value) / Total units. Given the total cost and land value, we can calculate the depletion per unit and then multiply it by the units extracted in 2014 to find the amount of depletion for that year.
Step-by-step explanation:
The amount of depletion for 2014 can be calculated using the formula:
Depletion per unit = (Total cost - Land value) / Total units
Depletion for 2014 = Depletion per unit x Units extracted in 2014
Given that the total cost is $4,000,000 and the land value is $400,000, the depletion per unit can be calculated as follows:
Depletion per unit = ($4,000,000 - $400,000) / 10,000,000 = $0.36 per unit
Therefore, the amount of depletion for 2014 can be calculated as:
Depletion for 2014 = $0.36 x 1,800,000 = $648,000