Cost Estimation; High-low Method; MAPE: Horton Manufacturing Inc. produces blinds and other window treatments for residential homes and offices. The owner is concerned about the maintenance costs for the production machinery because maintenance costs for the previous fiscal year were higher than he expected. The owner has asked you to assist in estimating future maintenance costs to better predict the firm's profitability. Together, you have determined that the best cost driver for maintenance costs is machine hours. The data from the previous fiscal year for maintenance costs and machine hours follow:

Month	Maintenance Costs	Machine Hours
1	$2,625	1,499
2	2670	1590
3	2720	1605
4	2822	1655
5	2855	1775
6	3005	1880
7	2865	1785
8	2905	1805
9	2780	1695
10	2570	1410
11	2590	1550
12	2890	1425

Question:

- Use the high-low method to estimate the fixed and variable portions for maintenance costs.

- Graph the data points to check for possible outliers and determine whether the points selected in requirement 1 are representative of the date.

- Calculate the mean absolute percentage average error (MAPE) for the cost equation you developed in requirement 1.