Herbert Engineering is issuing new $22-$year bonds that have warrants attached. If not for the attached warrants, the bonds would carry a $10\mathrm{.}3\%$ annual interest rate. However, with the warrants attached the bonds will pay a $6\mathrm{.}3\%$ annual coupon. There are $30$ warrants attached to each bond, which has a par value of $$1,000.$ What is the value of the straight$-$debt portion of the bonds? Do not round your intermediate calculations.

a$.$ $$469\mathrm{.}35$

b$.$ $$656\mathrm{.}58$

c$.$ $$661\mathrm{.}21$

d$.$ $$530\mathrm{.}65$

e$.$ $$712\mathrm{.}29$