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1 gros = 12 lusin
3 gros = Rp. 1.296.000
dimasukkan dalam beberapa kantong
masing- masing 1 lusin
harga satu kantong
= 1.296.000 : 12
= Rp. 108.000
Nomor 4
1 kg = 2 pon
100 pon = 100 : 2 = 50 kg
dijual tiap kantong 2,5 kg
banyak kantong plastik
= 50 : 2,5
= 20 kantong plastik