Please explain STEP by STEP in THOROUGH DETAIL how this answer was discovered for the next problem:

A small appliance manufacturer is planning to open a repair facility that would receive broken appliances from customers and repair them. Customers would send their broken appliances to the facility, and when repaired, they would be returned directly to the customer. There are five different appliance models that would be repaired, identified here as A,B,C,D, and E. The industrial engineering department has provided estimates of the average time to repair each model. These mean times are, respectively, 23min,42min,19 min,27min, and 35min. The management wants to staff the facility in anticipation of a weekly return rate of 100 appliances per week for models A,B, and C, and a weekly return rate of 150 appliances for models D and E. The facility will operate one shift five days per week, but it is anticipated that each repairperson will spend an average of only 6.0 hours per day repairing appliances. How many repairpersons will be required for the facility? Solution: WL=100(23+42+19)+150(27+35)=17,700min=295hr/wk Available time AT=(5 days /wk)(6.0hr/ day )=30hr/wk per repairperson w=295/30=9.833 rounded up to 10 repairpersons A small appliance manufacturer is planning to open a repair facility that would receive broken appliances from customers and repair them. Customers would send their broken appliances to the facility, and when repaired, they would be returned directly to the customer. There are five different appliance models that would be repaired, identified here as A,B,C,D, and E. The industrial engineering department has provided estimates of the average time to repair each model. These mean times are, respectively, 23min,42min,19 min,27min, and 35min. The management wants to staff the facility in anticipation of a weekly return rate of 100 appliances per week for models A,B, and C, and a weekly return rate of 150 appliances for models D and E. The facility will operate one shift five days per week, but it is anticipated that each repairperson will spend an average of only 6.0 hours per day repairing appliances. How many repairpersons will be required for the facility? Solution: WL=100(23+42+19)+150(27+35)=17,700min=295hr/wk Available time AT=(5 days /wk)(6.0hr/ day )=30hr/wk per repairperson w=295/30=9.833 rounded up to 10 repairpersons