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| Math Central | Quandaries & Queries |
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Question from Brian: we had a 2.43% scrap rate last year, compared to a 1.28% this year. does this come out to a .47% improvement? |
Hi Brian,
1.28 is approximately half of 2.43 so the scrap rate has been cut nearly in half. If you want to say it in percentage terms the calculation is
[(new rate - old rate)/old rate] × 100 = [(1.28 - 2.43)/2.43] × 100 = - 47%
I would however not say there is a 47% improvement as this might be interpreted as the amount of scrap has been reduced by 47%. It is always dangerous to calculate with percentages. The numbers 2.43% and 1.28% are percentages of different things. You need to be careful to report that it is the RATE which has been cut in half.
Harley
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