Manufacturas monarca uses an automated packaging system in their finishing area. the packaging system costs $400,000. its market value will be $350,000 at the end of the first year and will drop 10% per year thereafter to a minimum of $33,000. operating costs are $5,000 the first year, increasing by 9% each year thereafter maintenance costs are a gradient series of $2,500. marr is 10%. determine the optimum replacement interval. show excel equations?

Penny poodle wanted to know which dog obedience training program was more effective: puppy pride, the approach she has been using for any years, or doggie do-right, a new approach. penny convinced 50 human companions of untrained dogs to participate in her study. the dogs and their humans were randomly assigned to complete the puppy pride or doggie do-right course. at the end of the training programs, all of the dogs were scored on their level of obedience on a standardized dog obedience checklist (scores could range from 10 to 100). the design of this study is: