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Chapter 2: Q.357 (page 185)

Kiyoshi鈥檚 phone plan costs \(17.50 per month plus \)0.15 per text message. What is the maximum number of text messages Kiyoshi can use so the phone bill is no more than $56.60?

Short Answer

Expert verified

The maximum number of text messages Kiyoshi can use are about261.

Step by step solution

01

Step Given information

The monthly phone bill is $17.50cost of one text message is$0.15.

02

Suppose the number of text message

Let the number of text message be x.

The monthly bill of $17.50plus number of messages times $0.15not more than $56.60:

17.50+0.15x鈮�56.600.15x鈮�39.1x鈮�260.6

Round off the number to its nearest integer:

x鈮�261

Therefore, the number of messages are about261.

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