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digunakan= 10x12 + 9 = 120+9 = 129buah
sisa 360-129 =231 buah
2 1/2 gros=144x2+144:2=288+72=360
1lusin=12 buah
10lusin 9 buah=12x10+9=120+9=129
sisanya = 360-129=231