ETA: solved. :)
I'm trying to work out what the real price of an item should be if that price plus sales tax makes a round number. (i.e., I really don't want to mess with change at A-Kon, and I don't want to eat the sales tax, either.)
So ... if the final round number price is $8.00 and the sales tax rate is 8.25%, what should the "real" price be? I think I can dredge up enough knowledge to set up the equation, but not enough to actually solve it correctly, because I seem to end up with the answer being the tax rate on $1.00 when I try.
It *should* be: X + X(.0825) = 8
Help appreciated, as well an explanation of what you did, so I can repeat it for 2 more prices, plzkthnx.
Honestly, you'd never know I went all the way through calculus in highschool, with a B average. Well, except for calculus in which I received a C by dint of hard work. Mine is not a math brain. But then again, my college majors didn't require any more math if you'd taken calculus, so I haven't done much math beyond calculating tips etc. since highschool, which probably explains a lot.
and I still got a 640 the first time and a 500ish the second time on the math part of the GRE. Go me!