Please see picture. Constraint equations are required.

9. Rico-AG is a German fertilizer company, which has just received a contract to supply 10,000 tons of 3-12-12 fertilizer. The guaranteed composition of this fertilizer is (by weight) at least 3% nitrogen, 12% phosphorous, and 12% potash. This fertilizer can be mixed from any combination of the raw materials described in the table below. % % % Current World Raw Material Nitrogen Phosphorous Potash Price/Ton AN 50 190 Dm SP 40 180 Dm CP 35 196 Dm BG 15 17 215 Dm Rico-AG has in stock 500 tons of SP that was bought earlier for 220 Dm/ton. Rico-AG has a long-term agreement with Fledermausguano, S.A. This agreement allows it to buy already mixed 3-12-12 at 195 Dm/ton. a) Formulate a model for Rico-AG that will allow it to decide how much to buy and how to mix. State what assumptions you make with regard to goods in inventory. b) Can you conclude in advance that no CP and BG will be used because they cost more than 195 Dm/ton