Plugging in rates would seem to be more applicable to me (a professional in the field) than to the target audience (people who don't know about app development.

Plugging in rates would seem to be more applicable to me (a professional in the field) than to the target audience (people who don't know about app development.) Maybe for the audience I think you're targeting: a few big buttons with labels such as "Thailand", "USA", "Western Europe", "Russia", "San Franspesive" and so on?