Răspunsuri

2014-04-13T22:26:39+03:00
X-salariul
30% din x=30/100*x=3/10*x=3x/10-prima
x+3x/10=3120  aducem la acelasi numitor
10x+3x=31200
13x=31200
x=2400
30/100*2400=30*24=720-prima
1 5 1
2014-04-13T22:38:05+03:00
Prima=30%x(x-salariu) ,30%x+x=3120=30/100x+x=3120=3/10x+x=3120,aduci la acelasi numitor amplificand cu 3x+10x=31200.13x=31200.x=2400lei