Problem 2-20 Consider the three stocks in the following table. Pt represents price at time t, and Qt represents shares outstanding at time t. Stock C splits two-for-one in the last period 91 51 102 100 200 200 100 46 112 100 200 400 46 200 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