Park company manufactrues high technology testing instruments. The instruments are complex and not many units of any particular model are sold. The last unit of model MF-59 sold was the eight off of the assembly line. The labor cost for that unit was 2456.50 and required 614125 hours of labor. The fourth unit, produced last month required 72.25 hours of labor. Assuming that learning has been consistent for this product, how many hours did it take to produce the first unit

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.