buku= b
pulpen=p
4b+2p=27.000
b+2p=12.000
3b=15.000
b=5.000
2p=12.000-5.000
2p=6.000
p=3.000
10 buku dan 10 bulpen = 10x5.000 + 10x3.000
=50.000 + 30.000
=80.000
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buku= b
pulpen=p
4b+2p=27.000
b+2p=12.000
3b=15.000
b=5.000
b+2p=12.000
2p=12.000-5.000
2p=6.000
p=3.000
10 buku dan 10 bulpen = 10x5.000 + 10x3.000
=50.000 + 30.000
=80.000