Ward Co. would like to estimate its monthly maintenance costs and has the following cost data avallable from the last 12 months Machine Maintenance setups cost 75 $58,500 80 $58,000 90 $66,000 95 $68,000 105 $75,000 102 $72,000 78 $59.500 81 $61.000 $61,500 83 $63,500 $64,500 99 $71.500 82 88 Using the high-low method, the cost function for maintenance costs is y = 75,000 + 105X y = 17.250+550X y = 780 +75X OO y3,600 +680X