$***$ THE SECOND ANSWER $(6\mathrm{.}57\%)$ IS NOT CORRECT $***$

$(1$ point$)($Exercise $6\mathrm{.}20)$ A $$1000$

par value $12$

$-$year bond with $9$

$\%$ semiannual coupons is selling for $$1210$

$.$ Find the yield rate convertible semiannually:

a$)$ Using the exact method.

ANSWER $=6\mathrm{.}46\%.$

b$)$ Using the refined version of the bond salesman's method.

ANSWER $=\%.$