A company manufactures two types of wooden chairs: type A and type B. Type A chairs sell for $45, use $15 worth of raw materials, and increase the company's variable labor and overhead costs by $20. Type B chair sells for $30, uses $10 worth of raw materials, and increases the company's variable labor and overhead costs by $8. Manufacturing both types of chairs requires two types of skilled labor: carpentry and finishing. Each type A chair requires 2 hours of finishing and 1 hour of carpentry labor. Each type B chair requires 1 hour of finishing and 1 hour of carpentry labor. The company can obtain all the needed raw materials weekly but only 120 finishing and 100 carpentry hours. Demand for both products is unlimited, but at most, 60 type-A chairs are bought each week. The company wants to maximize weekly profit (revenues - costs). If the letters A and B represent the number of chairs type A and type B that should be produced, which of the following should be the spreadsheet model of this problem/situation