Casas Modernas of Juarez, Mexico, is contemplating a major change in its cost structure. Currently, all of its drafting work is performed by skilled draftsmen. Rafael Jiminez, Casas owner, is considering replacing the draftsmen with a computerized drafting system. However, before making the change, Rafael would like to know the consequences of the change, since the volume of business varies significantly from year to year. Shown below are CVP income statements for each alternative. Manual System Computerized System Sales $1,860,000 $1,860,000 Variable costs 1,488,000 744,000 Contribution margin 372,000 1,116,000 Fixed costs 132,000 876,000 Net income $240,000 $240,000 Calculate the increase in Net income for each alternative if sales increased by $139,000. Increase in Net Income Manual System $ Computerized System $ Which alternative would produce the higher net income ?