Vaughn Company is constructing a building. Construction began on February $1$ and was completed on December $31.$ Expenditures were $$1,968,000$ on March $1,$$$1,248,000$ on June $1,$ and $$3,076,020$ on December $31.$

Vaughn Company borrowed $$1,145,430$ on March $1$ on a $5-$year, $13\%$ note to help finance construction of the building. In addition, the company had outstanding all year a $9\%,5-$year, $$2,433,900$ note payable and an $10\%,4-$year, $$3,482,600$ note payable. Compute the weighted$-$average interest rate used for interest capitalization purposes. $($Round answer to $2$ decimal places, e$.$g$.7\mathrm{.}58\%.)$

Weighted$-$average interest rate $\%$