Pret initial = 750
pret final = 990
[tex]x + \frac{10}{100}x = 990 =\ \textgreater \ x + \frac{x}{10} =990 =\ \textgreater \ \frac{10x}{10} + \frac{x}{10} = 990 =\ \textgreater \ \frac{11x}{10} = 990 =\ \textgreater \ [/tex]
=> 11x = 9900 => x=900 (pretul dupa prima majorare)
[tex]750 + \frac{x}{100} 750= 900 =\ \textgreater \ \frac{75x}{10}= 150 =\ \textgreater \ 75x=1500=\ \textgreater \ x=20 [/tex]
x=20%