A transportation company needs to determine the cost of capital of its shares common. The company's stock is currently selling for $ XXXXXXXXXXThe company expects pay a dividend of $ 3.40 at the end...

A transportation company needs to determine the cost of capital of its shares common. The company's stock is currently selling for $ 57.50. The company expects pay a dividend of $ 3.40 at the end of the year (2020). The following table shows the dividends of the last 5 years.

Year Dividend
2019 $ 3.10
2018 2.92
2017 2.60
2016 2.30
2015 2.12
After administrative costs, the company expects to earn $ 52 per share from a new issue.
a) Determine the growth rate of dividends from 2015 to 2019. (g =?)