Answer :
The effect on consolidated depreciation expense is credit for $2.5 million.
Effect of depreciation expense means a depreciation expense decrease net income when the asset's cost is placed on the income statement. Depreciation has function to account to reject the value of a fixed asset over time. The formula to calculate about effect of depreciation expense is cost of asset minus salvage value divided by useful life.
Depreciation expense to recorded in subsidiary accounts
$40 million / 10 = $4 million
Depreciation expense to recorded in consolidated accounts
$15 million / 10 = $1.5 million
Effect on consolidated depreciation expense:
$4 million - $1.5 million = 2.5 million
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