how to remember the formula of Average Age Of An Asset = Accumulated dep/ Dep expense

is there any logic behind it?

plz help

Yes.

Think straight-line depreciation: if you depreciate $8,000 per year for 7 years, then your accumulated depreciation is:

7\ years × \$8,000\ per\ year\ = \$56,000

So,

\frac{\$56,000}{\$8,000} = 7\ years

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thank you