Abdulrahman Company is developing a cost function for its total costs using the high-low method. The following data have been collected for the past year: Number of units produced Quarter Total Costs 1 5,000 SAR 850 2 6,500 925 3 7,000 950 4 8,000 1,000 Calculate the following amounts: a. The variable cost per unit b. The fixed cost c. The estimated total cost for 9,000 units