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 Post subject: Maths Help- KS3
PostPosted: Mon Dec 02, 2013 1:04 pm 
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Joined: Thu Mar 17, 2011 12:58 pm
Posts: 92
Hello all,

Any help much appreciated!

Question-
The yearly change in the yield of one particular crop in our area over the past 2 years was 20% increase followed by 20% decrease. What is the total percentage change over two years?

Thanks,


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 Post subject: Re: Maths Help- KS3
PostPosted: Mon Dec 02, 2013 1:12 pm 
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Joined: Wed Jul 01, 2009 1:04 pm
Posts: 1187
Start with 100.
20% increase in year 1 gives you 120.
20% decrease is year 2 gives you a decrease of 24, so net result of 96.

In maths terms, I would describe the change as (1+.2)*(1-.2)=.96, so a total chance of 1-.96= a reduction by 4%


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 Post subject: Re: Maths Help- KS3
PostPosted: Mon Dec 02, 2013 1:16 pm 
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Joined: Thu Mar 17, 2011 12:58 pm
Posts: 92
Thankyou Lady muck! great... the choice answers were
-4%, -1% , 0% , 1% and 4%.


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