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1P=1/2B
8P + 9B = 39000
4B + 9B = 39000
13B = 39000
B = 3000
1P = 1/2B
1P = 1500
1 PENGGARIS = 1500
karena:
Rp3.000x9 buah buku=Rp27.000
Rp39.000-Rp27.000=Rp12.000
Setengah dari Rp3.000 = Rp1.500
Rp1.500x8 buah penggaris = Rp12.000
Rp27.000+Rp12.000=Rp39.000
= 1.500/1 penggaris