Difference between revisions of "2011 AMC 12A Problems/Problem 1"
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== Problem == | == Problem == | ||
− | A cell phone plan costs | + | A cell phone plan costs <math>20</math> dollars each month, plus <math>5</math> cents per text message sent, plus <math>10</math> cents for each minute used over <math>30</math> hours. In January Michelle sent <math>100</math> text messages and talked for <math>30.5</math> hours. How much did she have to pay? |
+ | |||
+ | <math> | ||
+ | \textbf{(A)}\ 24.00 \qquad | ||
+ | \textbf{(B)}\ 24.50 \qquad | ||
+ | \textbf{(C)}\ 25.50 \qquad | ||
+ | \textbf{(D)}\ 28.00 \qquad | ||
+ | \textbf{(E)}\ 30.00 </math> | ||
+ | |||
== Solution == | == Solution == | ||
+ | The base price of Michelle's cell phone plan is <math>20</math> dollars. | ||
+ | If she sent <math>100</math> text messages and it costs <math>5</math> cents per text, then she must have spent <math>500</math> cents for texting, or <math>5</math> dollars. She talked for <math>30.5</math> hours, but <math>30.5-30</math> will give us the amount of time exceeded past 30 hours. | ||
+ | <math>30.5-30=.5</math> hours <math>=30</math> minutes. | ||
+ | Since the price for phone calls is <math>10</math> cents per minute, the additional amount Michelle has to pay for phone calls is <math>30*10=300</math> cents, or <math>3</math> dollars. | ||
+ | Adding <math>20+5+3</math> dollars <math>\boxed{\$28 \textbf{ (D)}}</math>. | ||
+ | |||
+ | ==Video Solution== | ||
+ | https://youtu.be/tWz5T2Db9AY | ||
+ | |||
+ | ~savannahsolver | ||
+ | |||
== See also == | == See also == | ||
{{AMC12 box|year=2011|before=First Problem|num-a=2|ab=A}} | {{AMC12 box|year=2011|before=First Problem|num-a=2|ab=A}} | ||
+ | {{AMC10 box|year=2011|before=First Problem|num-a=2|ab=A}} | ||
+ | {{MAA Notice}} |
Latest revision as of 12:09, 19 October 2023
Contents
Problem
A cell phone plan costs dollars each month, plus
cents per text message sent, plus
cents for each minute used over
hours. In January Michelle sent
text messages and talked for
hours. How much did she have to pay?
Solution
The base price of Michelle's cell phone plan is dollars.
If she sent
text messages and it costs
cents per text, then she must have spent
cents for texting, or
dollars. She talked for
hours, but
will give us the amount of time exceeded past 30 hours.
hours
minutes.
Since the price for phone calls is
cents per minute, the additional amount Michelle has to pay for phone calls is
cents, or
dollars.
Adding
dollars
.
Video Solution
~savannahsolver
See also
2011 AMC 12A (Problems • Answer Key • Resources) | |
Preceded by First Problem |
Followed by Problem 2 |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
All AMC 12 Problems and Solutions |
2011 AMC 10A (Problems • Answer Key • Resources) | ||
Preceded by First Problem |
Followed by Problem 2 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
All AMC 10 Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.