D (20 points) Luis Castillo, a commission merchant in Dallas, buys merchandise exclusively for principals. Listed below are five recent transactions. Compute Luis' commission on each purchase and the gross cost. (2 points for each correct answer) Prime Cost Comm. Local Air Gross Rate Commission Delivery Storage Freight Cost 18. $18,850 6% $93 $ 0 $152 19. $4,900 11% 0 195 20. $7,280 7.5% 43 75 94 21. $4,850 8% 0 110 108 22. $31,600 9.25% 65 55 50 80 107