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on february 1, arshak's investment account has a balance of $19,900. he deposited $1,200 on april 1 and $2,600 on may 1. he withdrew $8,400 on july 1. on november 1, arshak's balance was $14,990. find arshak's dollar-weighted annual yield for this nine-month period. (round your answer to two decimal places.)