The the depletion expense rate would be 2.
Rate = (Cost - Salvage Value) / Estimated value
= ($2,000,000 - $500,000) / 750,000 =2
Depletion expense is an accrual accounting technique used to allocate the cost of extracting natural resources such as wood (timber), minerals, oil from the earth and gas industries, where exploration and development costs are capitalized, and exhaustion is used as a logical system for accounting for these costs as an expense.
Like depreciation and amortization, depletion is a non-cash expense that gradually reduces the cost of an asset through a charge to scheduled income.
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