The market interest rate is 10%. An investment project requires an investment of $1000 today, and promises to yield $500 at the end of each year for 3 years. At the end of year 4 there will be a one-time cleanup cost of $50.a. Use a number line to show each of these cash flows, with the appropriate + or – sign. b. Without solving, write the numerical expression that would yield the net present value of this investmentc. Briefly state the rule you should use to decide whether or not to make this investment.

Because of the violent nature of the sport, professional american football players are at risk of suffering concussions (or brain injuries) during the violent collisions that occur between players during the game. violent collisions involving hits to the head are particularly risky. suppose the commissioner of the national football league (nfl) institutes a rule requiring players to wear a new, lighter helmet that is designed to reduce head trauma during collisions between players on the field. while the new helmets the probability of a concussion resulting from each individual collision, at the same time the new helmets could also give football players an incentive to play more , which could potentially the amount of violent collisions and thus the number of concussions suffered by nfl players, all else equal.