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| Math Central | Quandaries & Queries |
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Question from Sui: Hi, I would like to ask your favor for reviewing the following percent change in sales calculation, did I do it right? I am surprise/wondering with the big amount of the percentage result. Your assistance and guidance would be highly appreciate. Sales for month of August 2000: 5,198,750 IDR Sales for month of February 2008: 1,664,800 IDR Thanking you, |
Hi Sui,
Let's simplify the numbers to see if your calculations seems reasonable.
Suppose the sales for month of August 2000 were 5,000,000 IDR and the sales for month of October 2000: 10,000,000 IDR. The difference is 5,000,000 IDR and hence there is a 100% increase.
Suppose the sales for month of August 2000 were 5,000,000 IDR and the sales for month of October 2000: 15,000,000 IDR. The difference is 10,000,000 IDR and 10,000,000 IDR is twice 5,000,000 IDR and hence there is a 200% increase.
Suppose the sales for month of August 2000 were 5,000,000 IDR and the sales for month of October 2000: 25,000,000 IDR. The difference is 20,000,000 IDR and 20,000,000 IDR is four times 5,000,000 IDR and hence there is a 400% increase.
Suppose the sales for month of August 2000 were 5,000,000 IDR and the sales for month of October 2000: 60,000,000 IDR. The difference is 55,000,000 IDR and 55,000,000 IDR is eleven times 5,000,000 IDR and hence there is a 1,100% increase.
This is almost the same situation as your problem and the resulting percentage is almost the same.
I checked your calculations and they look fine to me,
Penny
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