Grouper Company is constructing a building. Construction began on February 1 and was completed on December 31. Expenditures were $ 1,848,000 on March 1, $ 1,248,000 on June 1, and $3,031,810 on December 31. Grouper Company borrowed $ 1.136,530 on March 1 on a 5-year, 12% note to help finance construction of the building. In addition, the company had outstanding all year a 9%, 5-year, $ 2,091,200 note payable and an 10%, 4-year $ 3,726,200 note payable. Compute the weighted-average interest rate used for interest capitalization purposes. (Round answer to 2 decimal places, eg. 7.58%.) Weighted-average interest rate