Selling bonds.$$Lunar Vacations needs to raise $ $6$ comma $500,000$ for its new project$($a golf course on the$$ moon$).$ Astro Investment Bank will sell the bond for a commission of $2\mathrm{.}5\%.$ The market yield is currently $7\mathrm{.}3\%$ on$$ twenty$-$year semiannual bonds. If Lunar wants to issue a $6\mathrm{.}3\%$ semiannual coupon$$ bond, how many bonds will it need to sell to raise the $ $6$ comma $500,000?$ Assume that all bonds are issued at a par value of $ $1,000.$