The yield of strawberry plants deffends on the amount of fertilizer fed to the plants. Agricultural research shows tha an acre of strawberry plants will yield 450 pounds of strawberries when 50 cubic feet of fertilizer are applied. If 10
cubic of feet of fertilizer are applied, the yield will be 900 pounds of strawberries. Use linear interpolation to
estimate the yield if 68 cubic feet of fertilizer are applied.