Question

The telephone company offers two billing plans for local calls. Plan 1 charges ​$ per month for unlimited calls and Plan 2 charges ​$ per month plus ​$ per call.
a. Use an inequality to find the number of monthly calls for which Plan 1 is more economical than Plan 2.

Answer 1

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a.
38<14+0.05x
24<0.05x
x>480
b. When the number of calls per month is greater than 480, then Plan 1 is more economical. Example: If the number of calls is greater than 480 say 500, then charges in plan 2 will be $39, but Plan 1 is more economical and charges will be $38.