Telco company

The upstairs communications company offers customers a special long distance calling rate that includes a $0.10 per minute charge. Which of the following represents this fee scheduale where m represents the number of minutes and c is the overall cost of the call.

1) c=$0.35m
2) c=$0.25+$0.10
3) c=$0.25+$0.10m
4) c=$0.25m+$0.10m

Correct result:

c =  3

Solution:

c(m)=0.25+0.10m 1.min..0.35 2.min…0.45  c=3

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