Need help specifically with section A the answer is NOT 2.40, 3.10, 0.013, 29.04, 2.81, 2.59, 2.07, or 22.58

Problem 16-03 the tire needs to be replaced. Specifically, for tires with a lifetime below 30,000 miles, Grear will refund a customer $1 per 100 miles short of 30,000 . a. For each tire sold, what is the expected cost of the promotion? If required, round your answer to two decimal places. X b. What is the probability that Grear will refund more than $50 for a tire? If required, round your answer to three decimal places. V c. What mileage should Grear set the promotion claim if it wants the expected cost to be $2.00 ? If required, round your answer to the hundreds place. miles