7. Using the high-low points method, the variable cost of operations per kilo of materials used is 8. Using the same high-low points method, the fixed cost of operations is 9. What is the cost function of the costs of operation? 10. Assuming 150 kilos of material usage is expected to occur next month, how much will be the estimated operations cost based on the cost function generated from high-low method? 11. Using the least squares method, the average rate of variability per kilo of materials used is 12. Using the least square method, the fixed portion of the cost is