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January 29, 2015

January 29, 2015

Posted by **Tom** on Tuesday, May 7, 2013 at 11:23pm.

- Math (Percentage) -
**drwls**, Wednesday, May 8, 2013 at 6:27amI will let a be the decimal (not the %) discount.

New price = P'

Original price = P

P' = (1-a)P*(1+a) = 0.19 P

(81% final discount)

Then

1 - a^2 = 0.19

a = 0.9

The "a" discount is 90%

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