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coklat:y
4x + 2y = 6000 |dikali2= 8x + 4y = 12.000
3x+4y = 10000 |dikali 1= 3x + 4y = 10.000
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5x=2000
x=400
4(400)+2y=6000
1600+2y=6000
2y=6000-1600
2y=4400
y=4400:2
y=2200
1y+1x
(400)+(2200
2600
kembaliannya 5000-2600=2400