A stock has had returns of $18\mathrm{.}8$ percent, $28\mathrm{.}8$ percent, $21\mathrm{.}6$ percent, $9\mathrm{.}9$ percent, $34\mathrm{.}6$ percent, and $26\mathrm{.}8$ percent over the last six years. What are the arithmetic and geometric returns for the stock?