Three years ago, Kuiper Corp. issued 70 zero coupon bonds, each with a face value of $1,000. The bonds originally had 30 years to maturity with a 9.4% yield to maturity. Interest rates have recently decreased and the bonds now have a 7.6% yield to maturity. The market value of Kuiper's equity is $20,000. Find the weight Kuiper should use for debt when calculating the weighted average cost of capital.