Things You'll Need. Sales for most current year (in dollars). Sales for initial year (in dollars). Calculator. Instructions. Subtract the earliest date's sales in dollars from the
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((current month's sales  last month's sales)/last month's sales)x100
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1 Obtain data that shows a change in a quantity over time. All you need to calculate a basic growth rate are two numbers  one that represents a certain quantity's starting value
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1. Review the calculation for calculating sales tax. The calculation is: Gross Sales  Gross Sales divided by (1+ Tax Rate) 2. Determine your tax rate. This will depend on the state
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