The Toussaint business is attempting to issue new $15$ year bonds for expansion projects. The company has $10\mathrm{.}4\%$ coupon bonds that sell for $$1,131\mathrm{.}86,$ make semiannual payments, and in $15$ years matures. What is the coupon rate that the company should set on its new bonds if it wants them to sell at par? Assume that the par value is $$1,000.$ Multiple choice: a$\mathrm{.}8\mathrm{.}80\%,$ b$.8\mathrm{.}50\%,$ c$.9\mathrm{.}10\%$ d$.8\mathrm{.}70\%,$ e$\mathrm{.}4\mathrm{.}40\%$