Two methods are under consideration for producing the case for a portable hazardous material photoionization monitor. a plastic case will require an initial investment of $75,000 and will have an annual operating cost of $27,000 with no salvage after 2 years. an aluminum case will require an investment of $125,000 and will have annual costs of $12,000. some of the equipment can be sold for $30,000 after its 3-year life. at an interest rate of 10% per year, which case should be used on the basis of a present worth analysis?

Turtle corporation produces and sells a single product. data concerning that product appear below: per unit percent of sales selling price $ 150 100 % variable expenses 75 50 % contribution margin $ 75 50 % the company is currently selling 5,600 units per month. fixed expenses are $194,000 per month. the marketing manager believes that a $5,300 increase in the monthly advertising budget would result in a 190 unit increase in monthly sales. what should be the overall effect on the company's monthly net operating income of this change?