Bending Moment - Composite Material

Homework Statement

http://www.apeg.bc.ca/reg/past-exams/documents/May2005-98-BS-6.PDF [Broken]
Page 3 - Question 2
Except that let M=60 N.m (instead of 75)

Homework Equations

Transformation Equations: Z = z * E / E(ref)

The Attempt at a Solution

Transforming the composite bar to a homogeneous one using the transformation equations, then computing the stresses.
Im getting wrong answers, what are the new z , I about neutral axis, and stresses??

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