Posted by Serena on Monday, August 9, 2010 at 6:40pm.
0.9x = 14.4
x = ?
x = 16
.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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