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50 = 100 - 2Q
2Q = 50
Q1 = 25
P2 = 100-2Q
60 = 100 - 2Q
2Q = 40
Q2 = 20
selisih Q (delta) = 5
selisih P (delta) = 10
delta Q/delta P x P1/Q1
5/10 x 50/25 = 1