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p = pensil
2b+1p=Rp6.000
2b+3p = Rp9.000
2p = 9000-6000
2p = 3.000
1p = 1.500
3p = 4.500
2b = 9000 - 4500
= 4.500
1b = 4.500: 2
=2.250