Actuarial FM question:

On Jan 1, 2013, Mary borrows $450,000 that she intends to repay 5 years later. Using full immunization strategy, she has constructed a portfolio of assets using 6 year and n year zero-coupon-bonds. Assuming an annual effective market interest rate of 5%, the par value for the 6 year zero coupon bond is $402,028.69.