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1 lusin = 22.500
1 buah = 22.500/12
= 1875
3 1/4 lusin = 12 x 3 1/4
= 39 buah
3 1/4 lusin = 39 x 1875
= 73.125
jadi harga 3 1/4 buku tulis adalah Rp 73.125,00