Microeconomic math questions (Answers included- just need explanations)

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Hi, I've got approximately 11 economic questions with answers. However, the answers don't explain the working out, and that's what I'm looking for (the step-by-step process on how to get to the answer, as it's quite math heavy). 

I'm happy to pay $5 for each question, or $60 for all of them. Please explain them clearly.  

Thanks for any takers!

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