I am stuck on a few fields that I've highlighted below. If you could please explain how you got the answers as well. Thank you.

Unter Components manufactures low-cost navigation systems for installation in ride-sharing cars. It sells these systems to various car services that can customize them for their locale and business model. It manufactures two systems, the Star100 and the Star150, which differ in terms of capabilities. The following information is available. Star100 $ 130 60 30 Costs per unit Direct materials Direct labor Variable overhead Fixed overhead Total cost per unit Price Units sold 180 $ 400 $ 580 4,000 Star150 $ 150 80 40 240 $ 510 $ 780 2,000 The average wage rate is $40 per hour. Variable overhead varies with the quantity of direct labor-hours. The plant has a capacity of E 20,000 direct labor-hours, but current production uses only 10,000 direct labor-hours. Required: a. A nationwide car-sharing service has offered to buy 2,500 Star100 systems and 2,500 Star150 systems if the price is lowered to $400 and $500, respectively, per unit. a-1. If Unter accepts the offer, how many direct labor-hours will be required to produce the additional systems? a-2. Complete the following table to determine the differential profit increase or decrease) if Unter accepts this proposal. Prices on regular sales will remain the same. b-1. Suppose that the car-sharing has offered instead to buy 3,500 each of the two models at $400 and $500, respectively. This customer will purchase the 3,500 units of each model only in an all-or-nothing deal. That is, Unter must provide all 3,500 units of each model or none. Unter's management has decided to fill the entire special order for both models. In view of its capacity constraints, Unter will reduce sales to regular customers as needed to fill the special order. Complete the table below to determine the total contribution margin with the special order added. b-2. How much will the profits change if the order is accepted? Assume that the company cannot increase its production capacity to meet the extra demand. C-1. Assume that, in the situation presented in requirement b-1, the plant can work overtime. Direct labor costs for the overtime production increased to $60 per hour. Variable overhead costs for overtime production are $10 per hour more than for normal production. Complete the table below to determine the total contribution margin. c-2. How much will the profits change in this situation? Reg A1 Reg A2 Reg B1 Req B2 Reg C1 Reg C2 Assume that, in the situation presented in requirement b-1, the plant can work overtime. Direct labor costs for the overtime production increased to $60 per hour. Variable overhead costs for overtime production are $10 per hour more than for normal production. Complete the table below to determine the total contribution margin. Star100 Star150 Total $ $ 180 3,500 630,000 230 3,500 805,000 $ $ $ 1,435,000 $ Special Order: Contribution margin per unit Number of units Total contribution margin Regular production: Contribution margin per unit Number of units Total contribution margin Total contribution margin for both: Additional direct-labor costs Additional variable overhead Total contribution margin for both (with additional costs) 360 $ 4,000 1,440,000 $ 510 2,000 1,020,000 $ $ $ 2.460,000 3,895,000 $ 3.895,000 Complete this question by entering your answers in the tabs below. Reg A1 Reg A2 Reg B1 Req B2 Reg C1 Reg C2 How much will the profits change in this situation? Increase in profit