a$.$ James Inc. issues a bond $($James bond, in short$)$ with a par value of $$1,000,$ a coupon rate of

$7\%$ per annum, and a YTM of $10\%.$ If the bond is selling for $$815\mathrm{.}66,$ what is the maturity of

the bond?

b$.$ How much would James bond be selling for if it was a semiannual bond with a maturity of

$6$ years?

I need help with my finanical calculator!