Contoh 2 : P = 940 – 48 Q + Q 2 Jika Q = 10 → Ep = ? Jawab : P = 940 – 48(10) + (10) 2 = 560 dP / dQ = – 48 + 2Q = – 48 + 2(10) = – 28 Ep = dQ / dP. P