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ΔQ/Q = ((110-100)/((110+100)/2)) = 10/105 = 0.095
ΔP/P = ((4-5)/((4+5)/2)) = -1/4.5 = -0.222
Arc Elasticity = (ΔQ/Q)/(ΔP/P) = 0.095 / -0.222 = -0.428
Therefore, the value of Arc Elasticity in this scenario is -0.428.