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Playing with Percentages

6/7/2018

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Suppose that your portfolio dropped in value by 30% last year but gained in value by 30% this year. Has your original portfolio value gained, lost or remained the same? If gained or lost, by what percent? If the loss and gain are reversed, that is, if your portfolio gained in value by 30% last year but lost in value by 30% this year, would the result be the same or different?
I have given this ‘puzzle’ to many friends and professionals. In most cases, the answer was: “The original value did not change. It remained the same.”

It is imperative that we do everything we can to help Americans young and old raise their numerical and statistical literacy so that they can calculate real-life problems using elementary arithmetic and statistics. 
​
MeToInfinity is my company that addresses this issue head-on. Once you attend my training sessions, you will never be afraid of math. Numbers and their patterns will fascinate you. You can use basic laws of probability to predict and estimate. Unsure what false positive and false negative mean, and how they can affect you? Sign up for my training and see how relevant knowledge can dramatically increase your creativity.
1 Comment
Nicole S link
5/27/2022 11:57:59 am

Great readingg this

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    Author

    Hasan Z Rahim

    Hasan Z. Rahim is a professor of mathematics and statistics at San Jose City College,
    located in the heart of Silicon Valley, California. 

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