a. Asset Turnover Ratio.
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b. Asset Age Ratio.
We can write the value of the gross fixed asset as:

If we divide this equation with depreciation expense we get:

Where,

,

and

Thus, the statement of average age ratio is:

Or, ‘the older the company’s asset, shorter is their remaining life, and more capital expenditure is needed to maintain their productive capacity’.
This ratio helps in forecasting the firm’s future capital expenditure.
c. Annual Capex to Depreciation Ratio.
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This ratio can be interpreted as:
i. If this ratio is less than 100%, we are replacing our fixed assets slower than the depreciation rate.
ii. This might indicate a need for catch-up investment.
iii. If the rate is almost equal to 100%, then probably, the capital expenditure is similar to the rate of its use.
However, before looking at this ratio the analyst needs to evaluate the strategies used by the company for capital expenditures, the standards, and methods used for providing depreciation, fixed asset’s grouping policy, etc.

