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permen = p
2c + 5p = 13000 dikali 3 => 6c + 15p = 39000
3c + 4p = 16000 dikali 2 => 6c + 8 p = 32000_
7 p =7000
P = 1000
2c + 5000 = 13000
2c = 8000
c = 4000
1c + 2p = 4000 + 2000 = 6000