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berarti 12 pulpen = 18000
18000/12 = 1500
oni berarti 1 pulpen = 1500
8 buku = 16800
16800/8 = 2100
berarti 1 buku = 2100
perbandingan
pulpen: buku
1500 : 2100
sama sama dibagi 300
5:7