a. Calculate the change in return for each security if the market experiences an increase in its rate of return of 13.8% over the next period. Security A's change in return will be 22.50%. (Round to two decimal places.) Security B's change in return will be 7.73 %. (Round to two decimal places.) Security C's change in return will be -2.35 %. (Round to two decimal places.) b. Calculate the change in return for each security if the market experiences a decrease in its rate of return of 9.1% over the next period. Security A's change in return will be - 14.83 %. (Round to two decimal places.) -5.10 %. (Round to two decimal places.) Security B's change in return will be Security C's change in return will be 1.55 %. (Round to two decimal places.)