Multiply the price by 1.08875. Try it with an easy figure - say the price is 100, including the sales tax this would be 108.875 (108.88 to two decimal places). If the original price was 50, then the total including the sales tax would be 50.044375 (50.04 to two places)
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Pretax price of 3 books @ 12.00 each is 12*3 = 36.00 Add 6% sales tax: 36.00*1.06 = 38.16
98,900.00
Your question is vague, but we can assume you're talking about adding sales tax to an item that is sold at retail. If the sales tax is 5 percent, multiply the item's tag price by 1.05, which gives you the total price. For example, if a sweater is 20 bucks, multiply that by 1.05, which gives you 21 dollars. Some people calculate the tax and then add it to the price. Five percent of 20 bucks is one dollar, so 20 plus one is 21.
8.5% of $20,000 is 8.5 x $20,000 / 100 or $1,700, so the total price would be $21,700
You take the original price and add 22% of it to get the final total.