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Re: Help with some python homework...

Date 2014-02-02 16:38 +0000
From MRAB <python@mrabarnett.plus.com>
Subject Re: Help with some python homework...
References <02c4c69d-71f1-4a01-86df-d4d5a7ffb3f5@googlegroups.com> <Lr8T1n00d3bjUJS01r8V2t> <mailman.6264.1391232938.18130.python-list@python.org> <d8c2b5bd-d56d-4327-b219-85f0b304b187@googlegroups.com>
Newsgroups comp.lang.python
Message-ID <mailman.6308.1391359140.18130.python-list@python.org> (permalink)

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On 2014-02-02 16:11, David Hutto wrote:
> price_per_book = 24.95
> discount = .40
> quantity = 60
>
The original problem says:

Suppose the cover price of a book is $24.95, but bookstores get a 40%
discount. Shipping costs  $3 for the first copy and 75 cents for each
additional copy. What is the total wholesale cost for 60 copies?

> Here:
> discounted_price = (1-discount) * price_per_book
>
> The discounted price should be price_per_book - discount
>
No, the discount of 0.40 is 40%, not 40 cents.

> shipping = 3.0 + (60 - 1) * .75
> shipping should be, I think, should be 3.0 + (quantity  * .75)
>
No, the shipping is 75 cents starting from the second copy.

> total_price = 60 * discounted_price + shipping
> replace 60 with quantity (quantity * discounted_price) + shipping
>
> print total_price, 'Total price'
>
> total_price gives:
> 945.45 Total price
> and just 24.55(price per book - discount is ) * quantity is $1473 without the shipping, so the total is way off already:
>
>
> I think the following is what you're looking for:
>
> price_per_book = 24.95
> discount = .40
> quantity = 60
> discounted_price = price_per_book-discount
> shipping = 3.0 + (quantity*.75)
> total_price = (quantity * discounted_price) + shipping
> print 'Total price: $%d' % (total_price)
> Total price: $1521
>

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Help with some python homework... scottwd80@gmail.com - 2014-01-30 21:12 -0800
  Re: Help with some python homework... Chris Angelico <rosuav@gmail.com> - 2014-01-31 16:30 +1100
    Re: Help with some python homework... sjud9227 <scottwd80@gmail.com> - 2014-01-30 22:24 -0800
      Re: Help with some python homework... Chris Angelico <rosuav@gmail.com> - 2014-01-31 17:38 +1100
        Re: Help with some python homework... sjud9227 <scottwd80@gmail.com> - 2014-01-30 22:48 -0800
      Re: Help with some python homework... Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-01-31 21:17 +1300
        Re: Help with some python homework... Chris Angelico <rosuav@gmail.com> - 2014-01-31 19:30 +1100
          Re: Help with some python homework... Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-01-31 23:46 +1300
        Re: Help with some python homework... Chris Angelico <rosuav@gmail.com> - 2014-02-01 11:57 +1100
        Re: Help with some python homework... Chris Angelico <rosuav@gmail.com> - 2014-02-01 12:34 +1100
        Re: Help with some python homework... David <bouncingcats@gmail.com> - 2014-02-01 14:17 +1100
        Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 18:14 -0700
          Re: Help with some python homework... Denis McMahon <denismfmcmahon@gmail.com> - 2014-02-01 19:32 +0000
            Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 17:12 -0800
              Re: Help with some python homework... Larry Hudson <orgnut@yahoo.com> - 2014-02-02 23:48 -0800
        Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 17:46 -0700
        Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 17:42 -0700
        Re: Help with some python homework... David <bouncingcats@gmail.com> - 2014-02-01 17:13 +1100
        Re: Help with some python homework... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-01 10:44 -0500
  Re: Help with some python homework... Neil Cerutti <neilc@norwich.edu> - 2014-01-31 13:51 +0000
  Re: Help with some python homework... Denis McMahon <denismfmcmahon@gmail.com> - 2014-02-01 03:02 +0000
  Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 17:35 -0700
  Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 22:18 -0700
    Re: Help with some python homework... Denis McMahon <denismfmcmahon@gmail.com> - 2014-02-01 19:45 +0000
    Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 08:11 -0800
      Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 08:36 -0800
      Re: Help with some python homework... MRAB <python@mrabarnett.plus.com> - 2014-02-02 16:38 +0000
        Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 08:57 -0800
          Re: Help with some python homework... Denis McMahon <denismfmcmahon@gmail.com> - 2014-02-02 17:43 +0000
            Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 10:09 -0800
            Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 11:08 -0800
              Re: Help with some python homework... David Hutto <dwightdhutto@gmail.com> - 2014-02-02 11:21 -0800
    Re: Help with some python homework... "Rhodri James" <rhodri@wildebst.org.uk> - 2014-02-02 17:15 +0000
  Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 22:04 -0700
  Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 17:07 -0700
  Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-01-31 22:19 -0700
  Re: Help with some python homework... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-01 10:50 -0500
  Re: Help with some python homework... Scott W Dunning <swdunning@cox.net> - 2014-02-01 23:06 -0700

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