I need to calculate the percent variance between a negative and positive number and am not sure how to do it. The numbers are $-45000000$ and $8500000$. Normally when I look at percent variance I would do the following, $\frac{8500000}{-45000000}-1$.
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Related:http://math.stackexchange.com/questions/716767/how-to-calculate-the-percentage-of-increase-decrease-with-negative-numbers – Vikram Mar 08 '15 at 15:20