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Verified answer
P1 = 400P2 = 600
∆P = 600 - 400 = 200
Q1 = 1000
Q2 = 800
∆Q = 800 - 1000 = -200
e = ∆Q/∆P × P1/Q1
= -200/200 × 400/1000
= -0,4
= |-0,4|
= 0,4