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Which one of the following would have the greatest present value, assuming a positive discount rate? $1,000 today plus $100 a month for 2 years O $1,000 today plus $200 a month for a year. $1,000 today plus $400 a month for six months O $2,200 today plus $200 a month for six months, O $2,200 today plus $100 a month for a year