To calculate the number of years until maturity, assume that it is currently January $15,2022.$ All of the bonds have a $$2,000$ par value and pay semiannual coupons.

$\backslash$table$[[,,,,\backslash$table$[[$Estimated$],[$$ Volume$]]],[$Company $($Ticker$),$Coupon,Maturity,Last Price Last Yield,$(000s),],[$Xenon$,$ Incorporated $($XIC$),5\mathrm{.}400,$January $15,2034,92\mathrm{.}685,??,57,362],[$Kenny Corporation $($KCC$),4\mathrm{.}125,$January $15,2029,??,3\mathrm{.}84,48,941],[$Williams Company $($WIC$0),??,$January $15,2031,104\mathrm{.}310,4\mathrm{.}12,43,802]]$

What is the coupon rate for the Williams Company bond?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

Coupon rate

$\%$