Runaround Corporation sells running shoes and during January they ran production machines for 29 comma 000 hours total and incurred $ 10 comma 500 in maintenance costs. During July they ran production machines for 15 comma 000 hours total and incurred $ 8 comma 600 in maintenance costs. Based on this​ data, what will total maintenance costs be if the machines are run for 18 comma 500 ​hours? (Round intermediary calculations to the nearest​ cent.)