In common parlance, there's a lot of leeway in definitions. 600% is, after all, 600% of 100%. 100% of 600% is 600%, and 600% of 100% is 600%. The differential is 500%, but 500% of 100% is 500%, not 600%. When you're reducing your words down to a conversational back-and-forth, you're not going to be talking like a lawyer trying to make a wish from a jerk-ass genie. His terms were inaccurate, but his point was gotten across that he was looking at it from the reversed perspective.
That stated, "you can now buy a year's worth of medicine, for what you used to pay for just two months' worth" would have been a better way to word it, I don't think anyone would argue that. It's more accurate by every regard, and still sounds good because it is a lot more in a way laypeople would visualize.
In common parlance, there's a lot of leeway in definitions. 600% is, after all, 600% of 100%. 100% of 600% is 600%, and 600% of 100% is 600%. The differential is 500%, but 500% of 100% is 500%, not 600%. When you're reducing your words down to a conversational back-and-forth, you're not going to be talking like a lawyer trying to make a wish from a jerk-ass genie. His terms were inaccurate, but his point was gotten across that he was looking at it from the reversed perspective.
That stated, "you can now buy a year's worth of medicine, for what you used to pay for just two months' worth" would have been a better way to word it, I don't think anyone would argue that. It's more accurate by every regard, and still sounds good because it is a lot more in a way laypeople would visualize.