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a portfolio had an original value of $8500 eight years ag.the current value of the portfolio is $45389.what is the average geometric return on this portfolio?

what is the answer to: you obtain a margin loan of 18000 to puchase some stock. the effective intrest rate on the loan is 7.8%.how much intrest will you pay if you repay the loan in 3 month. urgent respone needed

please answer:a portfolio had an original value of $8500 eight years ag.the current value of the portfolio is $45389.what is the average geometric return on this portfolio? urgent response need please