Aberforth Dumbledore Corporation began construction of a tavern on March 31, 2021. The project was completed on April 30, 2022. No new loans were required to fund construction. Aberforth Dumbledore had the following debts that were outstanding throughout the construction period: $4,700,000, 6% note $21,180,000, 9% bonds Construction expenditures incurred were as follows: March 31, 2021 $ 4,630,000 June 30, 2021 6,630,000 November 30, 2021 1,926,000 February 28, 2022 3,630,000 What is Aberforth Dumbledore Corporation's weighted average cost of debt?