Bonds A, B, and C are in a portfolio currently valued at $1,000,000. $300,000 are invested in bond A, $300,000 are invested in bond B, and the remainder is invested in bond C. Bond A has a duration of 2 years, bond B has a duration of 1.7 years, and bond C has a duration of 2.5 years. What is the duration of the portfolio of bonds?

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