A portfolio consists of the following two investments:

• a bond with face value of $100.00 paying annual coupons of 12% maturing in 5 years
• an annuity with payments of $50.00 at the end of each year for 5 years

The portfolio is comprised of 27% bonds and 73% annuities.

The term structure is flat and the current yield is10% paeffective.

Calculate the duration (D) of the portfolio. Give your answer to 2 decimal places.

D = ? years