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October 16th, 2009, 07:01 PM   #1
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please help me to solve this

a computer service firm charges $98 per month for an on-site maintenance contract. if no maintenance contract is in place, the firm charges $432 for an on-site visit. how many call-outs 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
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October 16th, 2009, 11:33 PM   #2
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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.
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October 18th, 2009, 02:06 AM   #3
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Re: please help me to solve this

thanks so much for helping me
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