$($Yield to$$ maturity$)$The Saleemi$$ Corporation's $$$$1$ comma $000$ bonds pay $11$ percent interest annually and have $9$ years until maturity. You can purchase the bond for $$$$855.$

a$.$What is the yield to maturity on this$$ bond?

b$.$Should you purchase the bond if the yield to maturity on a$$ comparable$-$risk bond is $15$percent$?$