A four$-$year promissory note for $$3800$ plus interest at $9\mathrm{.}5\%$ compounded semiannually was sold $18$ months before maturity for $$4481.$

What quarterly compounded nominal rate of return will the buyer realize on her investment? $($Do not round the intermediate calculations. Round your answer to $1$ decimal place.$)$

Quarterly compounded nominal rate of return

$\%$