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harga naik 20%
8.000 × 20% = 1.600
P2 = 8.000+1.600 = 9.600 ; Q2 = 60
(p-p1)/(p2-p1) = (q-q1)/(q2-q1)
(p-8000)/(9600-8000) = (q-80)/(60-80)
(p-8000)/1600 = (q-80)/-20
1600(q-80) = -20(p-8000)
1600q - 128.000 = -20p + 160.000
1600q = -20p + 160.000 + 128.000
1600q = -20p + 288.000
--------------------------------- ÷ 1600
Q = -1/80P + 180