x: 1.Klasse y:Business z: economy
I. x+y+z= 480
II. 2100*x+1200*y+800z=510 000
III. 2,5y=z | einsetzen (100%+150%=250%=2,5)
I. x+y+2,5y=480
II. 2100x+1200y+2,5*800*y=510 000
I. x+3,5y=480 x= 480-3,5y in II. einsetzen
II.2100x+3200y=510 000
II: 2100(480-3,5y)+3200y= 510 000
-4150y= -498 000 | /- 4150
y=120
x= 480-420=60
z=120*2,5= 300