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Verified answer
P1 = 10.000p2 = 20.000
∆p = 20.000 - 10.000 = 10.000
q1 = 250
q2 = 450
∆q = 450 - 250 = 200
e = ∆q/∆p × p1/q1
= 200/10.000 × 20.000/250
= 4.000.000/2.500.000
= 1,6