You multiply the percent ( so 40% = .4) by the number then add the product to the original number.
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You have to do the following calculation: Old-new=change 13.99-12.99=1 change/old*100=±7
percent of increase = (new amount - original amount)/original amount p = (35 - 25)/25 p = 10/25 = 2/5 p = 0.4 p = 40%
Original price - discount = new price Original price - (Original price x 0.15) = 18.00 Which can be written as: 1 Original price - 0.15 Original price = 18.00 Which can be written as: 0.85 Original price = 18.00 Wich can be written as: Original price = 18.00 / 0.85 Original price = 21.18 Note that since there is 15% off in the original price, the new price is essentially (100% - 15%) = 85% of the original price.
$40.50
55.25