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An electronics store sells two popular models of wireless headphones, model A and model B. The sales of these products are not independent of each other (in economics, we call these substitutable products because if the price of one increases, sales of the other will increase). The store wishes to establish a pricing policy to maximize revenue from these products. A study of price and sales data shows the following relationships between the quantity sold (N) and prices (P) of each model: NA = 18-0.57PA + 0.25PB NB = 28 +0.09P- 068PB Develop a spreadsheet for calculating the total revenue if PA = $20 and PB = $35. Design it so that the price-demand function parameters can easily be changed. Complete the spreadsheet below. Type integers or decimals. Round the quantities to the nearest integer as needed Do not include the $ symbol in your answers.) A B G Model Parameters for QTY Sold Constant Quantity Sold Revenue Model Price Coeff Price A Coeff Price B Total Revenue