7. Suppose a research analyst has provided you with the following returns over the last 50 years on three types of investments: Common stock: Long-term (30-year) U.S. Treasury bonds: Short-term (1-year) U.S. Treasury bills: 14.55%, 10.5% 8.15% Based on the research analysts' information, what was the long-run average annual risk premium for common stocks over U.S. Treasury bonds? Finally, what was the average annual risk premium for common stocks over short-term (1-year) U.S. Treasury bills