Answer and Explanation:
The computation is shown below;
1. The depletion expense for the year 2021 is as follows;
= $4,500,000 ÷ 900,000 tons × 240,000 tons
= $1,200,000
2. Yes the depletion would be the part of the product cost and the same would be involved in the inventory cost as it is to be shown under the cost of goods sold when the income statement is prepared