Adriana Corporation manufactures football equipment. In planning for next year, the managers want to understand the relation between activity and overhead costs. Discussions with the plant supervisor suggest that overhead seems to vary with labor hours. machine-hours, or both. The following data were collected from last year's operations 2,356 Month Labor-Hours Machine Hours 1 725 2 CON 680 1.516 745 1,457 780 755 4.39 745 1.575 720 4.33 1.33 700 1,453 790 1.547 11 675 12 710 1,288 Overhead Costs $ 102,741 103,654 109,819 188,318 116,286 114.582 107,047 102,027 106,146 113,167 104,10 110,075 Required: a. Use the high-low method to estimate the fixed and variable portions of overhead costs based on machine hours. b. Managers expect the plant to operate at a monthly average of 1.400 machine-hours next year. What are the estimated monthly overhead costs, assuming no inflation? Complete this question by entering your answers in the tabs below. Required A Required B Use the high-low method to estimate the fixed and variable portions of overhead costs based on machine-hours. (Round Variable cost" answer to 2 decimal places.) 42.50 Variable cost per machine hour) Fored cost Complete this question by entering your answers in the tabs below. Required a Required B Managers expect the plant to operate at a monthly average of 1,400 machine-hours next year. What are the estimated monthly overhead costs, assuming no inflation? Overhead costs