It is 100*(Old price - New Price)/Old Price, assuming that the New Price is less than the Old.
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200 is 80% of 250 (to verify -> divide 200 by 250). Therefore, the price reduction is 20%.
17%
A sale price.
There's a couple of ways. Multiply the price by the percent and subtract that total from the price or multiply the price by 1.00 minus the percent. The second way sounds more difficult but it's easier if you try it. To take 15 percent off a marked price, multiply the price by 0.85