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550 = 30p+20p+300
550 = 50p+300
550-300 = 50 p
P = 250/50 = 5
sorry kalo salah
550=2(p×15+p×10+15×10)
550=2(15p+10p+150)
550=50p+300
50 p=550-300
50 p=250
p=5