A $5\mathrm{.}5\%,20-$year municipal bond is currently priced to yield $7\mathrm{.}2\%.$ For a taxpayer in the $33\%$ marginal tax bracket, this bond would offer an equivalent taxable yield of:$12\mathrm{.}40\%\mathrm{.}3\mathrm{.}58\%\mathrm{.}10\mathrm{.}75\%\mathrm{.}8\mathrm{.}46\%.$