Woodco manufactures tables and chairs.  Each table and chair must be made entirely out of oak or entirely out of pine.  A total of 150 board feet of oak and 210 board feet of pine are available.  A table requires either 17 board feet of oak or 30 board feet of pine and a chair requires either 5 board feet of oak or 13 board feet of pine. Each table can be sold for $40 and each chair for $15.  Determine how can Woodco maximize its revenue?