1. so we are looking for how much her allowance is. Well we know that to get a percentage we just have to do the part over the whole and multiply by 100
so our equation looks like this (45/x) *100 = 15%
we can change it to 45/x = .15 we need to solve for x. so let get 45 = .15x 45/.15 = x
x = 300
2. You do this by first finding out how much tax there is so 350 * .07 = 24.5 now add that to 35 350 + 24.5 = 374.5
3. So we got figure out how much she marked it up it just like the tax problem but in reverse 26 - 20 = 6 20 * x = 6 where x is the percent we are looking for
