Convergence of Positive or Negative Subseries of Alternating Series, Intervals of Increase/Decrease

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How to resolve this problem:

% Change
Calculation with negative value. (google sheets)

Function : (new-old)/abs(old)

Examples:
Old New %
-3 2 166, 67%
0, 75 2 166, 67%

note: ABS (-X) = X

Thanks

Ernie-zmmk