Q&A #5617

Teachers' Lounge Discussion: Percentages

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From: William

To: Teacher2Teacher Public Discussion
Date: 2002101012:34:04
Subject: Use of Percentage Sign in equation

I was asked by a mother whether a percentage cane be represented in an
equation like the following. 

The example here asks:

"A shop keept sells 20% of his orange stock today @ $0.5 each and he
earns $50 today. So how many orange he has in stock when he start

I was asked whether this is an appropriate formau:

Say y is the original number of oranges

20%y * 0.5 = 50.

I was doubt that notation like "20 % y" means something else in
mathematic world...where the "%" is an operators of special use. 

Please help.

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