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She expects to be 20 minutes late. She has to pay $5 for every 10 minutes.
20 minutes / 10 minutes = 2
2 x $5 = $10
If she is 20 minutes late she needs to pay $20.
She would be willing to pay anything less that $10, because anything less than 10 would save her money.
Answer: b. any price less than $10