Question 63054This question is from textbook
: THIS IS ABOUT USING RATES.......
Wyonna bought a prepaid calling card for $5. It allows her to make 80 minutes worth of calls.
A. estimate the prepaid calling cards cost per minute. Explain your thinking.
B. Calculate the actual cost per minute
C. After purchasing her prepaid card, wyonna made a 15- minute call to her friend Samson. How much is the card worth now?
D. Wynonna’s home telephone service provides a calling card that cost 8cents per minute. Which calling card would u recommend she use? Why?
E.
Wynonna has made plans for a 7-day vacation. She expects to make 30minutes of calls each day. How many prepaid calling cards should she take along?
This question is from textbook
Answer by funmath(2933)   (Show Source):
You can put this solution on YOUR website! THIS IS ABOUT USING RATES.......
Wyonna bought a prepaid calling card for $5. It allows her to make 80 minutes worth of calls.
A. estimate the prepaid calling cards cost per minute. Explain your thinking.
A little more than $.06, because $4.80 would be $.06(80).
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B. Calculate the actual cost per minute
$5.00/80min=$.0625 per min.
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C. After purchasing her prepaid card, wyonna made a 15- minute call to her friend Samson. How much is the card worth now?
$5.00-$0.0625(15)
$5.00-$.9375
$4.0625
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D. Wynonna’s home telephone service provides a calling card that cost 8cents per minute. Which calling card would u recommend she use? Why?
The prepaid card is $.08-$.0625=$.0175 cheaper per minute, so I would recommend that. (We aren't told if the convenience of the home telephone service is worth almost 2 cents per minute.)
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E.
Wynonna has made plans for a 7-day vacation. She expects to make 30minutes of calls each day. How many prepaid calling cards should she take along?
7days(30min/day)=210 min
3(80 min)=240 min, therefore, she should take 3 prepaid calling cards.
Happy Calculating!!!
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