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October 16th, 2009, 07:01 PM  #1 
Newbie Joined: Oct 2009 Posts: 2 Thanks: 0  please help me to solve this
a computer service firm charges $98 per month for an onsite maintenance contract. if no maintenance contract is in place, the firm charges $432 for an onsite visit. how many callouts per year would make the maintenance contract worthwhile? by the way, i see a chart labels its y axis with "100's of surveys". what does this mean? thanks in advance 
October 16th, 2009, 11:33 PM  #2 
Senior Member Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3  Re: please help me to solve this
We have: 98 per month for service. How much would this be per year? 432 per callout. If there are n callouts per year, how much does it cost (in terms of n) for a year? We want (cost per year with service) ? (cost per year without service) Solve for n. Since you can't have "part of a callout", you will probably need to round up. "100s of surveys" is exactly what it says. The y axis has some labels, probably 1, 2, 3, etc. And you are supposed to multiply that by 100, and that's the number of surveys. 
October 18th, 2009, 02:06 AM  #3 
Newbie Joined: Oct 2009 Posts: 2 Thanks: 0  Re: please help me to solve this
thanks so much for helping me 

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