Consider the three stocks in the following table. Pt represents price at time t, and at represents shares outstanding at time t. Stock C splits two-for-one in the last period. 20 91 P2 101 96 CMU P1 101 51 122 100 200 200 22 100 200 400 56 61 Calculate the first-period rates of return on the following indexes of the three stocks: (Do not round intermediate calculations. Round your answers to 2 decimal places.) a. A market value-weighted index Rate of return % b. An equally weighted index Rate of return %