Mary Ellis owns a small manufacturing company and would like to develop more accurate estimates for overhead expenses when making planning decisions. She is pretty sure that overhead is a mixed cost that varies with direct labour-hours but she would like to do a proper analysis to determine the variable and fixed components. She collected the following information for the past 12 months on direct labour-hours incurred and total overhead expenses. Month January February March April May June to July August September October November December Direct Labour-Hours 1,500 1,680 1,800 250 2,520 2,700 3,300 3,900 4,500 500 4,200 2,700 1,860 3,900 Total Overhead Costs $ 44,000 $ 47,200 $ 48,000 $ 51,200 $ 53,600 $ 56,800 $ 59,200 $ 61,600 $ 60,000 $ 54,400 $ 49,600 $ 58,400 Required: 1. Using the least-squares regression method, estimate the variable overhead cost per direct labour-hour and the total fixed overhead cost per month. (Round Fixed cost to the nearest whole dollar amount and the Variable cost per direct labour-hour to 2 decimal places.) Variable overhead cost Total fixed cost I per direct labour-hour per month 2. Express the cost data derived in part 1 above in the form Y= a + bX. (Round Fixed cost to the nearest whole dollar amount and the Variable cost to 2 decimal places.) 3. Using the cost formula stated in part 2, estimate total overhead costs for a month where direct labour-hours are expected to be 3,900. (Round your Variable cost per direct labor hour to 2 decimal places and round your final answer to the nearest whole dollar amount.) Total overhead costs