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2 lusin = 24 buku.
Harga 1 buku : Rp. 44.000,00/24 = Rp. 1.883,00
a) Harga 17 buku = Rp. 1.883 x 17 = Rp. 31.167,00
b) Rp. 58.200,00 : Rp. 1.883,00 = 31 buku tulis.
b.58.200 : 1.833 = 31 buku