Deformation of solids

1. The problem statement, all variables and given/known data

Hey, I have problems solving this question. May I know how to solve this question. Somehow, the answer I got is to the power of negative. can someone show me the step by step solution to this question? (Question 18 from this paper) the link is below.
http://ift.tt/1jwE5MB

2. Relevant equations
E = Fl / Ae

3. The attempt at a solution

http://ift.tt/1jwE5MD

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