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October 21, 2014

October 21, 2014

Posted by **Serena** on Monday, August 9, 2010 at 6:40pm.

- math -
**Ms. Sue**, Monday, August 9, 2010 at 6:44pm0.9x = 14.4

x = ?

- math -
**Joey**, Monday, August 9, 2010 at 6:49pmx = 16

- math -
**Anonymous**, Monday, August 9, 2010 at 6:55pm.9 derives from the fact that you're paying 90/100 or 90% of the original price.

it's basically cross multiply. you want to find the original price (100). thus, the x in the denominator is across the 100

90/100=14.40/x

90x=1440

numerator of the left side multiply to the denominator of the right

=numerator of the right side multiply to the denominator of the left

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