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What is the correct answer for percent change when the start amount is zero dollars $0?
A value of zero or a negative value makes the percent change meaningless. Saying 100% when going from 0 to some other value is simply wrong. I have seen a similar situation several times when looking at a public company with a loss last quarter. On Google Finance or some other service, the PE ratio will be blank, N/A, or something like that. If the company does not currently have earnings, then the PE ratio is meaningless. Likewise, if the company previously did not have earnings, then the percent change of the earnings is meaningless. Also consider the example where the previous value was negative. If the previous value was negative 1 and the current value is positive 99, then this happens: A negative change? But the value went up! Obviously that value does not make sense and should not be shown.