Finding the missing value while multiplying a percentage I'm stumped on how to solve this:
y = (x*0.1)+2.7

So I'm trying to figure out what x must be for y to break even when 10% is added and an additional value, which is 2.7 here and could be substituted with z or something.

EDIT:

I don't think I'm asking the question correctly, so let me try this as a word problem instead.

I make a purchase for 2.70 and want to resale it and cover my cost. 
  There's a fee of 10% of my selling price.  What I need to figure out is
  what my minimal selling price must be in order for me to get my 2.70
  back after selling the item.

I may have the formula wrong and please forgive me if so.
 A: If you are trying to solve for $x$, then it's
$$
x = (y-2.7) / 0.1 = 10 ( y - 2.7).
$$
However, the textual description that "10% is added" makes me think that you want to solve $y = 1.1 x + 2.7$ instead, which would then be
$$
x = (y-2.7) / 1.1
$$
Hopefully that helps.
Edit:


*

*Let $x$ be the price for which you sell the item

*Let $f$ be the fraction of it you get to keep (so if there is a 10% fee, then you get to keep the other 90%, which would mean $f=0.90$)

*Let $y$ be what you originally paid for the item

*Let $p$ be the minimum amount of profit that you wish to make through the sale


Using the above symbols, we get the following relation for the value of $x$ that will give you the desired profit or more:
$$
 x \cdot f \ge y + p \Rightarrow x \ge (y + p ) / f
$$
For example, say you paid \$9.50 for a widget, that there is a 10% merchant's fee that must be paid, and that you require a profit of at least \$0.60 to make it worth your time. Then we get that you must price the widget at
$$
x \ge ( \$9.50 + \$0.60 ) / 0.9 = \$11.22222.
$$
