SOLUTION: A long-distance phone company charges $0.50 for the first minute and $0.15 for each additional minute. If Mark budgets $4 to call his sister once a month, how long can they talk?

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Question 29517: A long-distance phone company charges $0.50 for the first minute and $0.15 for each additional minute. If Mark budgets $4 to call his sister once a month, how long can they talk? How much will he be charged?
Answer by Evy(14) About Me  (Show Source):
You can put this solution on YOUR website!
Hello, I can help you!
I will solve this problem by working backwards meaning i will start with the total of $4 and work down.


First you should:
subtract .50 from $4 for the 1st minute of the call.
4.00-.50=3.50


Next step: divide 3.50 by .15
3.50%2F.15=23.33
round 23.33 minutes to 23 minutes


Now we have 23 minutes at .15(15 cents) and 1 minute at .50(50 cents):
23%2B1=24

Mark and his sister can talk for 24 minutes.


to find out how much he will get charged simply plug in the numbers:
1+min%28.50%29%2B+23+min%28.15%29


Multiply: Now you have
.50%2B3.45=3.95


So Mark will be Charged $3.95.


If you have any questions e-mail me at Southqueensb@yahoo.com
~EVY~