2. Rex Carr, owns a junk yard. Rex can use one of three methods to destroy ears. The rst method involves purchasing a shovel that will last one year and costs $10 and then paying his brother= Scoop, to bury the cars at a cost of $5 each. The second method involves Rex purchasing a hydraulic car smasher that costs $200 a year to own and then spending $1 for every car smashed into oblivion. The third method involves Rex purchasing a lowquality ear smasher at a cost of $300 a year to own and smashes ears at a marginal cost of $0.75 per :ar. It would be worthwhile for ex to buy a highquality smasher if he planned to dispose of: at least 400 cars per y :ar. no more than 400 cars per year. e) no more than 200 cars per year. J at least 410 cars per year. at least 200 cars per year