Math Question

Discussion in 'General Discussions' started by domini212, Sep 30, 2008.

  1. domini212

    domini212 Level III

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    During a show sale, the cost goes down half each day an item is not sold. If one pair of shoes cost $20.50 after 10 days. What is the orginal price?
     
    #1 domini212, Sep 30, 2008
  2. SoC

    SoC Moderator
    Staff Member

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    Location:
    Maaaaaaanchester!
    20.50 = day 10
    41 = day 9
    82 - day 8
    164 - day 7
    328 - day 6
    656 - day 5
    1312 - day 4
    2624 - day 3
    5248 - day 2
    10496 - day 1

    or

    20.50 x 2^9
    20.50 x 2(to the power 9)

    Because its 20.50 x (2x2x2x2x2x2x2x2x2)

    = 10496
     
    #2 SoC, Sep 30, 2008
  3. Cacklenub

    Cacklenub Level IV

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    That's a very expensive pair of shoes! :eek:

    (But yes SoC is right. :D)
     
    #3 Cacklenub, Sep 30, 2008