What is 20 percent off 640 dollars? If something costs \$640 and is on sale for 20% off, then how much would it cost? Here we will show you how to calculate how much you save (discount) and how much you have to pay if something you want to buy is regularly \$640, but is currently on sale for 20 percent off.

There are many ways of calculating your discount and final purchase price. One way is to multiply 640 dollars by 20 percent, and then divide the answer by one hundred, then deduct that result from the original price. See illustration below:

 \$640 SALE20% OFF

Purchase Price:
\$640

Discount:
(640 x 20)/100 = \$128.00

Final Price:
640 - 128.00 = \$512.00

Thus, a product that normally costs \$640 with a 20 percent discount will cost you \$512.00, and you saved \$128.00.

You can also calculate how much you save by simply moving the period in 20.00 percent two spaces to the left, and then multiply the result by \$640 as follows: \$640 x .20 = \$128.00 savings.

Furthermore, you can get the final price by simply deducting .20 from 1 and multiplying it by \$640 as follows: (1 - .20) x \$640 = \$512.00 final price.

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