The following fertilizers are available to a dealer: 18-46-0, 46-0-0, 10-34-0, 11-52-0, 0-46-0, 28-0-0, and 0-0-60 (KCl solubility = 3 lbs KCl/gal H2O). Determine the appropriate fertilizer materials and filler required to make 1000 gallons of 15-6-8 (assume 10 lb/gal density of source materials and final product, and 8.3 lbs/gal H2O).