You've collected the following information from your favorite financial website.

According to your research, the growth rate in dividends for Manta Energy for the previous $10$ years has been negative $10$ percent. If investors feel this growth rate will continue, what is the required return for the stock?

Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

Required return I