Runaround Corporation sells running shoes and during January they ran production machines for 20,000 hours total and incurred $9,000 in maintenance costs.During July they ran production machines for 14,000 hours total and incurred $7,200 in maintenance costs.

Based on this data, what is the cost formula for maintenance costs?

Based on this data, what will total maintenance costs be if the machines are run for 16,500 hours?