Acity government is considering two types of town-dump sanitary systems. design a requires an initial outlay of $4 with annual operating and maintenance costs of $5 for the next 15 years; design b calls for an investment of $3 with annual operating and maintenance costs of $8 per year for the next 15 years. select the better system based on bc analysis at 8% social discount rate (same as marr).

Special order carson manufacturing, inc., sells a single product for $36 per unit. at an operating level of 8,000 units, variable costs are $18 per unit and fixed costs $10 per unit. carson has been offered a price of $20 per unit on a special order of 2,000 units by big mart discount stores, which would use its own brand name on the item. if carson accepts the order, material cost will be $3 less per unit than for regular production. however, special stamping equipment costing $4,000 would be needed to process the order; the equipment would then be discarded. assuming that volume remains within the relevant range, prepare an analysis of differential revenue and costs to determine whether carson should accept the special order. use a negative sign with answer to only indicate an income loss from special order; otherwise do not use negative signs with your answers.