What are the equations for quantity sold, surplus quantity, and profit?

Sujito Electronix makes headphones for $22 and sells them for $32. Sujito has sold at least 50 headphones on average per week in the past, though the actual demand is unknown. Sujito has also often run short of supply in the past. After three months of release, the headphones are sold at 40 percent discount. Complete to model to calculate Quantity Sold, Surplus Quantity, and Profit. Be sure to use the modeling best practices we learned in Chapter 11. Build your model with Demand =51 and Quantity Produced =55, but your formulas must work for all scenarios. Data: SellingPriceCostDiscount%$$32.0022.0040% Model: Demand 51 Quantity Produced 55 Quantity Sold Surplus Quanity Profit