Nomor 8&9 Terimakasih

8. P1 = 10000
Q1 = 200
Ed = 2
P2 = 5000

Ed = 2
∆Q/∆P × P1/Q1 = 2
(Q2 - Q1)/(P2 - P1) × P1/Q1 = 2
(Q2 - 200)/(10000 - 5000) × 10000/200 = 2
(Q2 - 200)/5000 × 10000/200 = 2
(Q2 - 200)/100 = 2
Q2 - 200 = 200
Q2 = 200 + 200
Q2 = 400

Jawaban: E

9. P1 = 30000
Q1 = 50
P2 = 40000
Q2 = 30

Fungsi permintaan:
(P - P1)/(P2 - P1) = (Q - Q1)/(Q2 - Q1)
(P - 30000)/(40000 - 30000) = (Q - 50)/(30 - 50)
(P - 30000)/10000 = (Q - 50)/(-20) (kali 20 kedua ruas)
(P - 30000)/500 = (Q - 50)/(-1)
P - 30000 = 500(-Q + 50)
P - 30000 = -500Q + 25000
Pd = -500Q + 25000 + 30000
Pd = 55000 - 500Q

Jawaban: E