Beechtree Corporation sets chewing gum and during January they ran production machines tox 29,000 hours total and incurred $11.500 in maintenance costs Ouning July they ran production machines to 10.000 hours total and incurred $6,700 in maintenance costs Based on this data, what is the vanable maintenance cost per machine hour? OA. 50 58 per machine hour OB. $2.23 per machine hour OC. 50 42 per machine nour OD. 50 37 per machine hour