Hello! I'm having trouble with this practice question. Any help is greatly appreciated.

Quality Air Conditioning manufactures three home air conditioners: an economy model, a standard model, and a deluxe model. The profits per unit are $63, $95, and $135, respectively. The production requirements per unit are as follows: Number of Fans Number of Cooling Coils Manufacturing Time (hours) Economy 1 1 8 Standard 1 2 12 Deluxe 1 4 14 For the coming production period, the company has 220 fan motors, 340 cooling coils, and 2,600 hours of manufacturing time available. How many economy models (E), standard models (S), and deluxe models (D) should the company produce in order to maximize profit? The linear programming model for the problem is as follows: Max 63E + 955 + 135D s.t. 1E + 15 + 1E + 2S + 1D 220 4D 340 14D 2,600 E, S, D 20 Fan motors Cooling coils Manufacturing time 8E + 125 + The computer solution is shown below. Optimal Objective Value = 17700.00000 Variable Value Reduced Cost E 100.00000 0.00000 S 120.00000 0.00000 D 0.00000 -24.00000 Constraint Slack/Surplus Dual Value 1 0.00000 31.00000 2 0.00000 32.00000 3 360.00000 0.00000 Objective Allowable Allowable Variable Coefficient Increase Decrease 63.00000 12.00000 15.50000 95.00000 31.00000 8.00000 135.00000 24.00000 Infinite Allowable Allowable Increase Decrease 90.00000 50.00000 90.00000 120.00000 Infinite 360.00000 ESD Constraint 123 RHS Value 220.00000 340.00000 2600.00000 (a) Identify the range of optimality for each objective function coefficient. (If there is no upper or lower limit, enter NO LIMIT.) E to to D to (b) Suppose the profit for the economy model is increased by $6 per unit, the profit for the standard model is decreased by $2 per unit, and the profit for the deluxe model is increased by $4 per unit. What will the new optimal solution be? E S units units units D profit (c) Identify the range of feasibility for the right-hand-side values. (If there is no upper or lower limit, enter NO LIMIT.) constraint 1 to constraint 2 to constraint 3 to (d) If the number of fan motors available for production is increased by 120, will the dual value for that constraint change? Explain. Yes, the dual value will change because 120 is greater than the allowable increase of 90. Yes, the dual value will change because 120 is greater than the allowable increase of 12. No, the dual value will not change because there is no upper limit to how much the constraint can increase. No, the dual value will not change because 120 is less than the allowable increase of 310. S