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B = P - 600
2 (P-600) + 2P = 8.000
2P - 1.200 + 2P = 8.000
4P = 8.000 + 1.200
4P = 9.200
P(PENSIL) =2.300
buku = 2.300 - 600 = 1.700
2000-600=1400
jadi harga sebuah buku Rp. 1.400,00