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Long distance phone call

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Long distance phone call

by ollapodrida » Thu Jan 23, 2014 8:12 am
A certain phone company charges $2.50 for the first 10 minutes of a long-distance phone call plus $1.5 for the next 10 minutes plus $0.10 for each additional 1/3rd minute. What would this company charge for a phone call that was 75 minutes long?

(A) $9.50
(B) $18.00
(C) $19.00
(D) $20.50
(E) $22.00
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by dimochka » Thu Jan 23, 2014 8:55 am
The way I would solve this question is break the pieces down into separate parts:

Part 1: The first 10 minutes will cost $2.50
Part 2: The next 10 minutes will cost $1.50

We have now used up 20 minutes which cost us $4.00

The remaining 55 minutes will be charged at $0.10 per 20 seconds. We have 55*3 = 165 such segments.
165 * $0.10 = $16.50

[spoiler]$2.50 + $1.50 + $16.50 = $20.50[/spoiler]
Please feel free to private message me with any questions; I don't check the forums regularly, whereas PMs go straight to my email.
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by theCodeToGMAT » Thu Jan 23, 2014 11:14 am
first 10 min = 2.5$
next 10 min = 1.5$
0.10 for 20 seconds

75 minutes = 10min + 10min + 55mins

=> 2.5 + 1.5 + 55*3*(0.10)
=> 4 + 16.5
=> 20.5$

[spoiler]{D}[/spoiler]
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