There is a bug in the following code. Fix the bug and prove that it is correct.
public decimal GrowthPercent(decimal ThisQuarterSales, decimal LastQuarterSales)
if (LastQuarterSales == 0.0m && ThisQuarterSales == 0.0m)
// No sales means no growth.
if (LastQuarterSales == 0.0m && ThisQuarterSales > 0.0m)
// Any sales over zero is interpreted as 100% growth.
return (ThisQuarterSales / LastQuarterSales - 1.0m) * 100.0m;
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