Question: Prof. Chaos considers which device to purchase. Device A has the initial cost of $1,000, the useful life of 5 years, and the salvage value of $50. Device B has the initial cost of $200, the useful life is 2 years, and the upgrade cost of $200 in Year 1. Assume that the analysis period is given by the least common multiple of useful lives. What is the present worth of Device B?