In calculating depreciation

Question

If the rate of depriciation is more than 100%, the outcome in one would come 0 and next should come the negative value of the initial. However if we take a example, Initial = 500 Time = 2 years Rate = 100% The outcome in second comes in postive value due to the even power . I used the formulae - Outcome = Initial(1- (rate/100))² Is there an external applicable formulae?

Answer 1

if after 1 year you have nothing left, the depreciation in the second year is irrelevant, you still have nothing, and that is what the formula says, 1-100/100=0 and 0^2=0 trula