Micron Technology's bonds currently sell for $$1,230$ and have a par value of $$1,000.$ They pay a $$105$ annual coupon and have a $15-$year maturity, but they can be called in $5$ years at $$1,100.$

What is their yield to call $($YTC$)?$

Your answer should be between $4\mathrm{.}56$ and $8\mathrm{.}32,$ rounded to $2$ decimal places, with no special characters.