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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Help with some python homework...
Date: Sat, 01 Feb 2014 10:50:22 -0500
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On Fri, 31 Jan 2014 22:18:34 -0700, Scott W Dunning <swdunning@cox.net>
declaimed the following:

>Any chance you guys could help with another question I have?  Below is a code to a different problem.  The only thing I don’t understand is why when calculating the 'discounted price’ you have to subtract 1?  Thanks again guys!  
>

	Because the discount rate you have is the amount taken OFF the price.
But you need the price AFTER removing the discount amount 100% (1.0) - 40%
(0.4) discount => 60% (0.6) final price
 
>price_per_book = 24.95
>discount = .40
>quantity = 60
>discounted_price = (1-discount) * price_per_book
>shipping = 3.0 + (60 - 1) * .75
>total_price = 60 * discounted_price + shipping
>print total_price, 'Total price'
>
	You defined "quantity" but then never used it in the shipping and
total_price lines.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/