please I need step by step solution

Problem 3 (3 marks) What is the expected output for a plant with a design capacity of 108 chairs per day, if its effective capacity is 90 chairs and its efficiency is 90%? Problem 4 (3 marks) Awork centre operates 2 shifts per day, 5 days per week (8 hours per shift) and has 4 machines of equal capability. This is the effective capacity. If the work centre has a system efficiency of 95%, what is the expected output in hours per week? Problem 5 (10 marks) Janelle Heinke, the owner of Hot Pizza! is considering a new oven in which to bake the firm's signature dish, vegetarian pizza. Oven type A can handle 20 pizzas per hour. The fixed costs associated with oven A are $20,000 and the variable costs are $2.00 per pizza. Oven B is larger and can handle 40 pizzas an hour. The fixed costs associated with oven B are $30,000 and the variable costs are $1.25 per pizza. The pizzas sell for $14 each. a) b) c) d) What is the break-even point for each oven? If the owner expects to sell 9,000 pizzas, which oven should she purchase? If the owner expects to sell 12,000 pizzas, which oven should she purchase? At what volume should Janelle switch ovens? (Hint: this occurs when the profits are the same for both ovens)