For each extra minute, Tracy is being charged 0.25 dollars.
Work Step by Step
Let X represent the amount Tracy is being charged for each extra minute. A charge for 267 extra minutes means 267X. A charge of 69.99 for the monthly plan and a charge for 267 extra minutes means 69.99 + 267X. The total bill was 136.74. So: 69.99 + 267X = 136.74 Subtract 69.99 from both sides 267X = 66.75 Divide both sides by 267 X = 0.25