you can just divide it by two.
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(original price)-(% off in decimal form)*(original price)=[1-(% off in decimal form)]*(original price)=discounted price
in this case, (1-0.5)*(original price)=(original price)/2=discounted price
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15108
The original price was 34.20
You seem to be saying that 15% off gives a discounted price of 680, and asking what the original price was before the discount. Since the price was discounted by 15%, the discounted price is 85% of the original price. Dividing 680 by 0.85 gives 800 as the original price.
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.
OK, do the following. 12590 = 80% (original prince - 20%) 12590 / 80 = 157,375 157,375 * 100 = 15737,5 The original price is 15737,5