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1 lusin = 12 buah.
Persediaan awal = 2 kodi = (2 x 20) = 40 sprei
Terjual = 2 lusin = (2x12)= 24 sprei
Yang belum terjual = 40 - 24 = 16 sprei
1 lusin = 12 buah
Banyak yang belum terjual
= (2 x 20) - (2 x 12)
= 40 - 24
= 16 buah sprei