Calculate the fair share price of the four companies, on the basis of an EV$/$EBITDA multiple of $7x$

$\backslash$table$[[$Company$,$Revenues,$\backslash$table$[[$EBITDA$],[$margin$]],$Net Debt,$\backslash$table$[[$Number of$],[$shares$]]],[$Blue$,1000,20\%,250,500],[$Yellow$,1500,16\%,500,400],[$Red$,1200,22\%,350,700],[$Green$,2500,12\%,600,850]]$