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3 kg= 3 x 10 = 30 ons
2 gros= 144 x 2 : 12 = 24 lusin
3/4 kodi= 3/4 x 20 = 15 buah
5 liter= 5 x 1000 = 5.000 cm3
Kerugian = Rp 30.000.000 - Rp 24.000.000 = Rp 6.000.000
= 6.000.000/30.000.000 x 100 % = 20% kerugiannya
skala = 900 / 4 = 1 : 225
Maaf kalo ada yang salah.. ^_^