Please help with these, thank you very much!

4. (4 points) Archer Company is a wholesaler of custom-built air-conditioning units for commercial buildings. It gathered the following monthly data relating to units shipped and total shipping expense: MonthUnits ShippedTotal Shipping Expense January February 40 March April May June July $ 1,800 $ 2,300 $ 1,700 $ 2,000 $ 2,300 $ 2,700 $ 1,200 30 60 50 70 80 20 Required: Using the high-low method, calculate the equation of a cost line for the shipping expense for this company (Y - a + bX) 3. (4 points) Jardon Painting paints the interiors and exteriors of homes and commercial buildings. The company uses an activity-based costing system for its overhead costs. The company has provided the following data concerning its activity-based costing system. Activity Measure Activity Cost Pool Annual Activity PaintingSquare meters 30,000 square meters Job support.. Jobs 1,100 jobs Not applicable The "Other" activity cost pool consists of the costs of idle capacity and organization-sustaining costs. The company has already finished the first stage of the allocation process in which costs were allocated to the activity cost centers. The results are listed below: Job Painting Support Other Total Total150.000 SL10.000 $75.000 S335,000 Required: a. Compute the activity rates (i.e., cost per unit of activity) for the Painting and Job Support activity cost pools by filling in the table below. Round off all calculations to the nearest whole cent. Job Painting Support Activity Rate Prepare a Product Margin report for ONE job that involves painting 400 square meters and has direct materials cost of $1,000 and direct labor cost of $1,190. The total sales revenue from this job is $4,600. b