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How To Calculate Sales Tax In Your Head
If you ever have a shopping cart full of groceries and want to get a rough idea of how much sales tax you’ll pay, here’s a quick and accurate guide to estimating your sales tax bill.
This depends on the state you’re in—some states have rates as low as 0% (no sales tax), all the way up to nearly 10%. You can determine your state’s rate by checking a receipt for a recent purchase. The total sales tax will be displayed and usually ranges from 5% to 9%.
(1) Round your purchase to the nearest tenth. If your purchase total is $476.99, round it up to $480.
(2) Know your state tax rate and round it to the nearest whole number. This can be as low as 5% or as high as 9%.
(3) Follow these tricks to estimate your taxes and your total:
5%:
(a) Divide the total of your purchase by 10, ie: remove the last zero from the total. So $480 becomes $48.
(b) Now divide by 2. So $48 becomes $24, your approximate sales tax.
6%:
Follow the steps for 5% tax. Now, divide the original amount by 100 (change the decimal by two), so $480 becomes $4.80, or about $5.
Now add that amount to the 5% sales tax: $24 + $5 = $29.
7%:
Same as 6%, but add the total divided by 100 twice. So $24 + $5 + $5 = $34.
9%: Divide your total by 10, so $48. Now divide by 10 again and subtract: $4.8, or about $5, so $48-$5 = $43.
8%: Follow the same steps as for the 9% sales tax, but subtract twice: $48-$5-$5=$38.
By following these steps, you can quickly estimate the tax on any item you buy.
Here’s another common mental math question: How can you quickly estimate, in your head, a fair tip for your waiter or waitress?
Most tips say we should tip 15-20%. Here’s how to quickly estimate the top you give a server.
Let’s say the restaurant bill is $53.
(1) Divide this by 10: $5.30
(2) Multiply this by 2: $10.60, or about $11.00.
(3) The midpoint between these 2 is the 15% tip, so in this case about $8.00.
(4) The amount in (2) is a more generous 20% tip.
Choose an amount between (2) and (3) if your service was very good.
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