Question 999667
{{{x}}}=.. selling price
{{{300}}}= cost
{{{x-300}}}= markup
{{{0.4*x}}}= 40% of selling price
The problem says that
{{{x-300=0.4x}}}
That is the equation to solve.
{{{x-300=0.4x}}}--->{{{x-0.4x-300=0
}}}--->{{{0.6x-300=0}}}--->{{{0.6x=300}}}--->{{{
x=300/0.6}}}--->{{{x=500}}}