Mr. Krabs wants to promote his new krabby patty recipe to his customers, but doesn't know how many sales-crabs he will need to employ. He has 20,000 customers that he needs to call upon 30 times each year. The average length of a sales call is 15 minutes. In addition, the average amount of sales-crab selling time available annually is 1500 hours. Use the workload method to determine how many sales-crabs Mr. Krabs should employ