$1.$ A $$1000,15-$year semiannual bond, callable at $$1100$ after $10$ years, has a $4\mathrm{.}3\%$ coupon rate and sells for $$1025.$

Calculate the yield$-$to$-$maturity $($YTM$).($Do not include the $"\%"$ sign.$$ Round to $2$nd decimal point.$$ Example:$12\mathrm{.}3456\%$ entered as $12\mathrm{.}35)$