Explain me these two methods

In annuity method amount equal to cost of asset is invested in investment and earn interest on yearly basis In sinking fund method the amount equal to depreciation is invested in ...

under sinking fund method when you purchase asset rs 100000 estimated life 5 yrs depreciation on it every year calculated and that amount of dep invested in depreciation fund al...

under annuity method suppose you purchase assets of 100000 interest calculated there on and same amount of asset you invested outside and earn some interest so it would recover los...