Clyde's Custom Cottage Couture manufactures Muskoka Chairs made from top quality pine. Customers appreciate the classic cottage feel, the quality, and the comfort of this furniture whether at the cottage or at home in the back yard. Clyde builds 10 chairs per day using the following resources: Labour 32 hours per day @ $18 per hour Raw Materials (Wood) $1 per foot, each chair requires 40 feet of pine Electricity $100 per day Capital (building and equipment) $124 per day The labour hour productivity for Clyde's business using the Single Factor Productivity calculation is ____ chairs per hour