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0,5kg=9000/3=3000
3,5kg=?
0,5×7=3,5kg
3000×7=21000
3/2 kg = 9.000
Jadi 9.000 : 3/2
= 9.000 x 2/3
= 6.000 per kg
Apabila membeli 3 1/2 kg atau 7/2 kg, maka 6.000 x 7/2 = 21.000