S&P 500 index is 1,600, and the 3-month future price is 1,590. The 6-month futures price is 1580. The risk-free rate is 2% (annual). What are the estimated dividends of the S&P500 index in the next three months? What are the estimated dividends of the S&P500 index in the next six months? What are the estimated dividends of the S&P500 index between the next three and six months? Show all calculations