A symmetrical I section beam with total depth of 600 mm, moment of inertia of 5.0 x 10° mm4 and concrete area of 113,500 mm2 will be used on a 9.0 m simple span. Assume unit weight of concrete is equal to 24 kN/m3. The beam carries a concentrated live load of 30 kN at midspan. The beam will be pre-tensioned with multiple seven-wire strands below the centroid at constant eccentricity of 200 mm. The initial and final prestressing force is 1000 kN and 800 kN respectively. Calculate the net deflection under service loads if E = 13734 MPa. (Note: include the sign if the %3D answer is negative) (mm)

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