below 30,000 miles, Grear will refund a customer $1 per 100 miles short of 30,000. Construct a simulation model to answer the following questions. (Use at least 1,000 trials.) (a) For each tire sold, what is the average cost of the promotion (in \$)? (Round your answer to two decimal places.) ! (b) What is the probability that Grear will refund more than $25 for a tire? (Round your answer to three decimal places.)