Fie x - acest salariu
Avem : x+ [tex] \frac{20x}{100} + \frac{30}{100}[x+ \frac{20x}{100} ]=1560[/tex]⇒[tex]x+ \frac{x}{5} + \frac{3}{10} [x+ \frac{x}{5} ]=1560[/tex]⇒[tex]x+ \frac{x}{5}+ \frac{3}{10}* \frac{6x}{5} =1560 [/tex]⇒[tex]x + \frac{x}{5} + \frac{9x}{25} =1560[/tex]⇒[tex]25x+5x+9x=1560*25 (am eliminat numitorul )[/tex]⇒39x=39000⇒x=1000 lei , a fost salariul inainte de majorare