Question: The answer is 16 years Please show step by step and formulas used. Problem 54.19 John purchased three bonds to form a portfolio as follows:

The answer is 16 years
Please show step by step and formulas used.
Problem 54.19 John purchased three bonds to form a portfolio as follows: Bond A is purchased for X and has a duration of 20 years. Bond B is purchased for Y and has a duration of 20 years. Bond C is purchased for X + Y. The duration (in years) of the portfolio at the time of purchase is 18. Deter- mine the duration (in years) of Bond C at the time of purchase
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