1) For a business with consistent refunds in prior months (e.g. money back guarantee), this has the odd effect of always being able to show growth compared to previous months, even if revenue is constant.

2) Right, that's how I calculated 58%, but does it really make sense to calculate the base off of some arbitrarily low first-month revenue? Does it make sense that a company with strong first month sales should have a much lower growth rate than a company with abysmal first-month sales, given a certain current monthly revenue?