4. A stockbroker gathers the following data. Stock FB splits two-for-one during the period. Stock TA FB ZM Beginning of Period Price ($) Shares 31 6,000 92 300 42 2,200 End of Period Price ($) Shares 29 6,000 54 600 43 2,200 a. Calculate the returns on both the price-weighted index and the market value- weighted index of three stocks over the period. b. Explain the difference in returns between the two indexes