x= pret initial
x-[tex] \frac{10}{100} x[/tex]= [tex] \frac{90}{100} x[/tex] -> pret dupa prima reducere
[tex] \frac{10}{100}x- \frac{10}{100} \frac{90}{100} x=1215
[/tex]
[tex] \frac{10}{100}x- \frac{9}{100} x=1215 [/tex]
[tex] \frac{81}{100} x=1215[/tex]
[tex]x= \frac{121500}{81}
[/tex]
x=1500
