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.

2. Relevant equations
E = Fl / Ae

3. The attempt at a solution

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