24 (2 points) Runaround Corporation sells running shoes and during January they ran production machines for 21,000 hours total and incurred $11,000 in maintenance costs. During July they ran production machines for 10,000 hours total and incurred $8600 in maintenance costs. Based on this data, what is the variable maintenance cost per machine hour? $0.78 per machine hour $1.91 per machine hour $0.86 per machine hour $0.22 per machine hour