3.4. Consider a resource-allocation problem having the following data. Resource A B C Contribution per unit Resource Usage per Unit of Each Activity 1 2 3 Amount of Resource Available 30 0 20 20 222 0 500 40 600 30 1,000 $50 $40 $70 Contribution per unit = profit per unit of the activity. a. Formulate and solve a linear programming model for this problem on a spreadsheet. b. Express this model in algebraic form.