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Coklat = y
4x + 2y = 6000....(1)
3x + 4y = 10000....(2)
Pers (1) dikalikan 2 lalu eliminasi y
8x + 4y = 12000
3x + 4y = 10000
_______________-
5x = 2000
X = 400
Substitusi x = 4000
1600 + 2y = 6000
2y = 4400
Y = 2200
50000 - (x + y) = 50000 - 2600 = 47400
Kembalian = Rp 47.400