Both of the companies can be represented by an equation. The first company being f(a) and the second company bring f(b). f(a)=$0.06x+65 f(b)=$0.10x+48 We want to find where they are equal, so we can set the equations equal to each other. $0.06x+65=$0.10x+48 From here we can simplify the equation. 17=$0.04x 425=x