$10-$year municipal bond, $4\mathrm{.}5\%$ coupon $($annual coupons$),$ $$5000$ par. Current price: $$5375$

What is the bond's yield to maturity?

If the bond can be called $3$ years before maturity at a call price of $$5225,$ what is the bond's yield to call?

$4$ years later, interest rates have fallen, and the bond now trades with a YTM of $2\mathrm{.}7257\%.$ What's the yield to call?