#### Answer

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