HIGHLINE SCHOOL DISTRICT MATH OLYMPIAD
March 25, 2000

The Cell Phone Problem



Sally Savvy's Company offers two plans for her cellular phone service. Sally can choose either the individual plan or the corporate plan:


Individual plan:
55¢ per call and $25 monthly service charge.


Corporate plan:
25¢ per call and a $50 monthly service charge.



Give Sally some specific advice on which plan she should choose.

Your response should be made on the Response Sheet. You may use both sides of the sheet. Be sure to describe any patterns you see in this problem, and your strategies for solving it.