How did we got these answers for questions 1 to 4 can you explain step by step thanks

Assume you can produce 20 units per hour. Each operator (of each step A, B, and C) receives regular wages of $12/ hour for the first 8 hours, and overtime wages of $15/ hour for any additional time. Ten hours per day is the maximum work time permitted. A finished unit sells for $15 while its direct material cost is $5 per unit. What is the profit during the regular 8 hours? Answer: 1312 What is the profit during including overtime? Answer: 1622 Would you hire a skilled operator whose wage rate was $20/ hour (regular time), but could perform step B at a processing time of 2 minutes/unit? (Assume no overtime is used.) What is the new process capacity in units per hour with the new skilled operator for process step B? 20 What is the result of the profit with the skilled 5o operator minus the profit without the new skilled operator? 336