please SHOW math steps on how to find part a and b.

Jamison Day Consultants has been entrusted with the task of evaluating a business plan that has been divided into four sectionsmarketing, finance, operations, and human resources. Chris, Steve, Juana, and Rebecca form the evaluation team. Each of them has expertise in a certain field and tends to finish that section faster. The estimated times taken by each team member for each section have been outlined in the table below. Further information states that each of these individuals is paid $30/hour. n HR Times Taken by Team Members for Different Sections (minutes) Section Member Marketing Finance Chris 40 100 Steve 65 35 Juana 80 120 Rebecca 20 115 Operations 85 25 125 145 45 75 140 160 a) The optimal assignment of the function to a team member that minimizes the cost is: Marketing Member Finance Member Member Operations HR Member b) The cumulative cost of the optimal assignment of a function to each member = $ (round your response to two decimal places)