Apple Company is constructing a building. Construction began on January 1 and was completed on December 31. Expenditures were $6,400,000 on March 1, $5,280,000 on June 1, and $8,000,000 on December 31. Apple Company borrowed $3,200,000 on January 1 on a 5-year, 12% note to help finance construction of the building. In addition, the company had outstanding all year a 10%, 3-year, $6,400,000 note payable and an 11%, 4-year, $12,000,000 note payable.

What is the weighted-average interest rate used for interest capitalization purposes?

a. 10.85%

b. 10.65%

c. 11%

d. 10.5%