11. A garden shop wishes to prepare a supply of special fertilizer at a minimal cost by mixing two fertilizers, A and B. The mixture is to contain: at least 45 units of phosphate; at least 36 units of nitrate; at least 40 units of ammonium.
Fertilizer A costs the shop $.97 per pound.
Fertilizer B costs the shop $1.89 per pound.
fertilizer A contains 5 units of phosphate and 2 units of nitrate and 2 units of ammonium. fertilizer B contains 3 units of phosphate and 3 units of nitrate and 5 units of ammonium. Formulate the problem of deciding how many pounds of each fertilizer should the shop
use in order to minimize their cost.