I need the betas but i have to get the stock splits.

I have submitted a question i need help with below. I need the betas but i have to get the stock splits. Please help with the calculation of the returns from dividends accounting for the stock splits. See below;3a). Using the stock price and returns data in Exhibits 4 and 5, and the capital structureinformation in Exhibit 3, calculate the asset betas for the comparable firms.3b). What is your estimate of Ameritrade’s cost of capital? Be sure to explain carefully howyou determine the inputs.Note that the Case Exhibits are provided for you as an Excel spreadsheetAdditional InstructionsTo estimate equity betas, you will first need to calculate returns from the price and dividend data,accounting for stock splits. To calculate returns in the month of a stock split, convert the stocksplit information into a number as follows: x for y stock split = x/y (e.g. 5 for 4 stock split =1.25). Then calculate returns:-If No Stock Split:-If x for y Stock Split