Required information [The following information applies to the questions displayed below.] Alden Company's monthly data for the past year follow. Management wants to use these data to predict future variable and fixed costs. Estimate both the variable costs per unit and the total monthly fixed costs using the high-low method. (Do not round intermediate lculations.) 2. Predict future total costs when sales volume is (a) 383,000 units and (b) 423,000 units