The following information is available regarding the total manufacturing overhead of Bursa Mfg. Co. for a recent four-month period. Manufacturin Hour300,000 6, 000 3,200 January February March April 224, 000 263, 800 180,000 4, 900 2,900 a-1. Use the high-low method to determine the variable element of manufacturing overhead costs per machine-hour. (Round your answer to 2 decimal places.) a-2. Use the high-low method to determine the fixed element of monthly overhead cost b. Bursa expects machine-hours in May to equal 5,300. Use the cost relationships determined in part to forecast May's manufacturing overhead costs c. Suppose Bursa had used the cost relationships determined in part a to estimate the total manufacturing overhead expected for the months of February and March. By what amounts would Bursa have over- or underestimated these costs