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30 x 12 = 360
jumlah = 900 + 360 + 80 =1380
- 45 kodi = 45×20 = 900 buah
- 1 lusin = 12 buah
- 30 lusin = 30×12 = 360 buah
dit : berapa buah seluruh barang yg ada di toko = 900 + 360 + 80 = 1340 buah