Jane's cell phone plan is $40 per month if she uses 200 minutes of call time or less.

Question

Jane's cell phone plan is $40 per month if she uses 200 minutes of call time or less. If she goes over 200 minutes, she is charged $0.15 per minute she uses. If her bill last month was $58.00, how many minutes over 200 did Jane talk?

Answer 1

Ok, so you know Jane used more than 200 minutes.  Since she used 200 minutes, there was a base charge of $40. Since her bill was $58, you can subtract $40 for the first 200 minutes of call time.  So that leaves $18 in overages charges at a rate of $0.15 per minute.  

 

$18 / $0.15/min = 120 minutes over