please assist, i keep on getting the wromg answer

Suppose Wacken, Limited, just issued a dividend of $2.13 per share on its common stock. The company paid dividends of $1.70,$1.87,$1.94, and $2.05 per share in the last four years. a. If the stock currently sells for $50, what is your best estimate of the company's cost of equity capital using the arithmetic average growth rate in dividends? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) a. What if you use the geometric average growth rate? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Answer is complete but not entirely correct