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15% can also be written as 0.15 in decimal form.

Multiply the decimal form to the exact cost of the merchandise being purchased, and the result is how much sales tax you'll be paying on top of your purchase.

Ex. I'm buying a sweater that costs $20.99. How much is 15% sales tax?

20.99 x 0.15 = 3.15

The sales tax is $3.15

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Q: How can you calculate 15 percent sales tax?
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