Forming an Inequality from a Real-World Cost Scenario Involving Time and Money
Forming an Inequality from a Real-World Cost Scenario Involving Time and Money
Secondary 3
A Telco company charges \(\$5\) for the first \(10\) minutes of international call and \(90\) cents per minute subsequently.
On a particular month, Kenny travelled overseas for work.
The bill for his international call was not more than \(\$20.25\) for the month.
Form an inequality to find the maximum number of minutes Kenny spent on international call for the month.
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Answer:\(5+0.90(x-10)\le20.25\). With proportional billing, maximum \(485/18\) minutes, approximately 26.9 minutes. With billing per started minute, 26 minutes.
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