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Rumusnya => P-P1/P2-P1 = Q-Q1/Q2-Q1, Masukin kerumus jadi :
P-20rb/30rb-20rb = Q-60/45-60
P-20rb/10rb = Q-60/-15 (dikalikan silang) sehingga menjadi
-15P+300rb = 10000Q-600rb
-15P = 10000Q-900rb (dibagi-15 sehingga menjadi)
P = -666 2/3Q +600000
Good Luck! :D