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jadi harga @ buku = Rp. 22500/12
= Rp. 1875,-
harga 3 1/4 lusin = harga 39 buku
= 39 x Rp. 1875
= Rp. 73125,-
= 13/4x12=39
1 lusin buku=12 buku
harga 1 buku = 22500/12= 1875 ini adalah harga 1 buku
3 1/4 lusin buku = 39 buah buku
jadi : 1875 x 39 = Rp.73.125