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coklat = k
a= 4d + 3k = 10.900 | *2| 8d + 6k= 21800
b= 3d + 2k = 8000 |*3| 6d + 6k = 24000
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2d= - 2200
d= - 1100
3d + 2k = 8000
-3300 +2k = 8000
2k = 11300
k = 5650
jadi 5k + 2d =
5.5650 + 2. -1100 =