I am trying to solve the equation with which I came up from the accounting task:
Round((0.844+delta)*1; 2)=0.89
or generally:
Round((a+delta)*n; 2)=b; delta=?
Of course, delta is not single value, it is interval, set of values but to achieve uniqueness let define the final solution delta^ as:
delta^=sgn(delta)*Min(Abs(delta))
Of course, I can always run iterative search with the step value 0.001 to solve the problem, but maybe there exist explicit function of delta^ as a function of a, b, and n?
It is the usual arithmeitc rounding with 2 positions.