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September 20, 2014

September 20, 2014

Posted by **Amanda** on Friday, April 27, 2007 at 7:06pm.

120,000

simplest way: by ratio

2000:120000=x:180000

2/120 = x/180000

120x = 360 000

x = 3000

second way

let revenue be R, let Advertising cost be A

then R = kA, where k is a constant

replace the given case where R=120000 and A = 2000

120000=k(2000)

k = 60 000

so R = 60 000A

sub 180000 for R....solve ... A=3000

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