Topic: Percentage, Interpolation, Prorate, inch/feet, etc.
Percentage Calculations Can Get Very Tricky.  
We have spreadsheets that can help.  Now you can answer any of the below questions in seconds.
 
Percentage Questions Answered in Seconds:
     * What is 25% of $5,000?
     * Change from 250 to 100 is a decrease of what percentage? 
     * Adding 15% to 12,345 is?
     * Subtracting 25% from 145,678 is?
     * 12,345 is 10% of what number?
     * $25 with 40% markup is?
     * From $40 to $75 is a markup of what percentage?
 G1 - Math.xlsx
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