A boutique clothing store receives an average of 50 patrons per shift. The owner is evaluating whether to employ one, two, three, or four clerks. The expected average waiting times are seven minutes with one clerk, four minutes with two clerks, three minutes with three clerks, and two minutes with four clerks. Customer waiting time is valued at $1 per minute. The salary for each clerk per shift, including benefits, is $70. Analyze to determine how many clerks should be hired