Even if it's not to that extent, the bigger number leaves a bigger impression without giving it much thought, even in a relatively trained mind. Once you parse that it says percent, sure, you can deduce that it's describing it proportionally and infer that the price was probably pretty low to begin with, but why do we need to have titles that require this to get the gist of it when we could describe it in a more clear manner from the beginning?

edit: changed punctuation mark.