Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapters 1-5 - Cumulative Review Exercises - Page 379: 34


Your call to Afghanistan can last 89 minutes.

Work Step by Step

We see that the cost per minute to the Philippines is: $\$0.084/minute$. Since you made a 95 minute phone call, the total cost was: $0.084*95=\$7.98$ Since you started with $\$20$, the amount left is: $20-7.98=\$12.02$ Thus you can use this amount to call Afghanistan at a rate of $\$0.134$: $12.02\div 0.134\approx 89.7\approx89$ minutes (We round down because you do not have enough funds for the last minute.) Therefore, your call to Afghanistan can last 89 minutes.
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