$($Related to Checkpoint $7\mathrm{.}1)($Calculating rates of return$)$ On December $10,2007,$ the common stock of Google Inc. $($GOOG$)$ was trading for $$718\mathrm{.}42.$ One year later the shares sold for only $$308\mathrm{.}82.$ Google has never paid a common stock dividend. What rate of return would you have earned on your investment had you purchased the shares on December $10,2007?$

The rate of return you would have earned is $\%.($Round to two decimal places.$)$