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300 = 2,5Q + 150
300 - 150 = 2,5Q
150 = 2,5Q
150/2,5 = Q
Q = 60
P = 400
400 = 2,5Q + 150
400 - 150 = 2,5Q
250 = 2,5Q
250/2,5 = Q
Q = 100
dari 60 ke 100