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Homework Help: Price Elasticity, Partial Derivative

  1. Oct 20, 2013 #1
    Hi all,

    I've got a question regarding a price elasticity problem and a partial derivative.
    That's what's given for the exercise:
    Screen Shot 2013-10-20 at 14.40.12.png

    So, first of all we calculate all the demand with the given information. Which is:
    Screen Shot 2013-10-20 at 14.38.24.png

    And then we come to the actual problem. (4. b) )

    Screen Shot 2013-10-20 at 14.38.11.jpg
    How do they get the partial derivative here? I assume that they are using the quotient rule, right? I would be really glad for a step by step explanation.

    Thank you so much!
  2. jcsd
  3. Oct 20, 2013 #2
    Hello there,

    You should write your questions (Using the template btw, which you did not use!) instead of showing us images. This is because PF can't be sure that those images will stay up, and if they don't, then this thread will be of no use.

    I believe somewhere in the PF guidelines, you can read what I just said.
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