The following information is available regarding the total manufacturing overhead of Bursa Mfg. Co. for a recent four-month period. Machine- Hours Manufacturing Overhead January 5,100 $ 310,000 February 3,200 224,000 March 4,900 263,800 April 2,500 190,000 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 a 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?