Eco Furniture Ltd. makes wooden furniture. One of their products is a wooden desk. The exterior is made of walnut, a high quality wood, but the interior drawers are made of pine, a less expensive wood. The budgeted direct materials quantities and prices for one desk are: Rate per Cost for QuantityInput Unit One Desk $62/square Walnut 9 square metres $558 metre $19/square Pine 3 square metres $57 metre During the month of November 600 desks were produced. The actual material volume and costs were: Total Total Quantity Cost Walnut Pine 5,250 square metres $336,000 2,250 square metres $123,750 What is the direct materials efficiency variance for pine? O a. $8,550 U $0.250 UL