Question 3: Anaconda Mining Company shipped 9,000 tons of copper concentrate for $450,000 in March and 11,000 tons for $549,000 in April. Use the high-low method to estimate the shipping costs for 12.000 tons to be shipped in May. Question 4: Average maintenance costs are $1.50 per machine hour at an activity level of 8,000 machine hours and $1.20 per machine hour at an activity level of 13,000 machine hours. Assuming that this activity is within the relevant range, total expected maintenance cost for a budgeted activity level of 10,000 machine hours would be closest to (Show all calculations)