Michael J. answered 05/17/15
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
A percent is a number out of 100. We set up a proportion to find the amount spent.
Let x = the amount spent
x / 90000 = 12 / 100
Cross-multiply.
100x = 1080000
Divide both sides of equation by 100.
x = 10800
$10800 is spent on advertising.