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12 buku tulis = 22.500
3 1/4 lusin= ?
1buku tulis = 12 : 12 dan 22.500 : 12 = 1 buku = 1.875
3 1/4 = 3 1/4 x 12 = 39
= 39 x 1 dan 1.875 x 39 = 39 dan 73.125
berarti , 3 1/4 = 39 bukutulis harganya, 73. 125