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100% -10%=90%------90/100=0,9
x + y= 3500
0,9x + 0,93y=3170
-0,9(x + y= 3500)
- 0,9x -0,9y = -3150
0,9x + 0,93y=3170
-----------------------------------
0,03y= 20
y=666,67
x +y =3500
x + 666,67=3500
x=2833,33