The following accompanying table shows the relationship between the speed of a computer's CPU and its benefits and costs. Assume that all other features of the computer are the same (that is, CPU speed is the only source of variation), and only the CPU speeds listed below are available for purchase.CPU GHzTotal BenefitMarginal BenefitTotal CostMarginal Costs2.0$1,000 $900 2.5$1,400 $1003.0 $300$1,200 3.5$1,900 $1,500 4.0$2,000 $400 The total cost of a 2.5GHz computer is:
A. $200.
B. $1,000.
C. $900.
D. $100.
Answer: B
Economics
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You invest an amount today for four years that pays 6% annually. The bank compounds annually. At the end of the four years you will have $150. What amount must you invest today?
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