<PRE><B>Question 288017</B>
You have the right(ish) answer, except you&#39;re not interpreting it correctly.&lt;br&gt;

&lt;b&gt;Option 1:&lt;/b&gt; $210 set up fee plus $10/inch(x) of ad
C = $210 + 10x &lt;br&gt;
&lt;b&gt;Option 2:&lt;/b&gt; No set up fee plus $25/inch(x) of the ad
C = 25x &lt;br&gt;
To locate the crossover point, where the two equal each other, we need to calculate where:
Option 1 = Option 2, so: &lt;br&gt;
210 + 10x = 25x Now subtract 10x from each side, giving:
210 = 15x&lt;br&gt; Divide each side by 15:
210/15 = 15x/15 &lt;br&gt; giving us:
14 = x &lt;br&gt;I&#39;m guessing that you got here before, but now remember that &quot;x&quot; is &lt;i&gt;inches of ad space,&lt;/i&gt; so at 14 ad inches the costs equal out. &lt;b&gt;Below&lt;/b&gt; 14 inches Option 2 is less expensive. &lt;b&gt;Above&lt;/b&gt; 14 inches Option 1 is less expensive, and bob&#39;s your uncle!
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