The method of depreciation that charges a varying amount to depreciation expense for each period of an asset's useful life depending on its usage is called the method.

The correct answer is Straight Line Method.

Explanation:

Depreciation in a straight line is one of the most commonly used depreciation methods, mainly because of its simplicity and ease of implementation, since it only requires a simple arithmetic operation.

Depreciation in a straight line implies a constant depreciation, a periodic rate of unchanged depreciation based on the useful life of the asset depreciated.

In this depreciation method it is assumed that the asset undergoes constant wear and tear over time, which does not always conform to reality, since there are assets that, as they are used, the level of wear increases , is growing.

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