A farmer grows two crops: lettuce and beans. The farmer uses three inputs: labor, seed, and fertilizer. The past prices and the quantities of each are given in the following tables: prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> Physical Quantities Past Last This Inputs/outputs Prices Year Year Outputs: Lettuce $1500/ton 500 tons 600 tons Beans $1300/ton 200 tons 100 tons Inputs: Labor $10/hour 1,000 hrs. 1,200 hrs. Seeds $12/pound 300 lbs. 320 lbs. Fertilizer $500/ton 10 tons 12 tons Required: a. Calculate productivity measures for last year and this year using past prices. b. Calculate the percentage change in productivity.