how do i do this?

Assume the betas for securities A, B, and C are as shown here. (Click on the icon located on the top right corner of the data table below in order to copy its contents into a spreadsheet.) Calculate the change in return for each security if the market experiences an increase in its rate of return of 13.2% over the next period. Calculate the change in return for each security if the market experiences a decrease in its rate of return of 10.8% over the next period. Rank and discuss the relative risk of each security on the basis of your findings. Which security might perform best during an economic downturn? Explain