share	Base date stock price (dollar)	current stock price (dollar)	Number of shares in circulation (full)
A	800	1000	1000
B	900	1200	500
C	700	800	500

It can be said that only the above three assets and risk-free assets are traded in the market. The market is now in equilibrium.The market value of risky assets in the market is now set at the market price.The weighted average is calculated based on the total amount. 1) If the benchmark stock index is 100, what is the current stock index? 2)An investor wants to invest 5 million won in a market portfolio.What is the amount of investment in B shares? 3)An investor holds 10 million won. They want to invest 20% in risk-free assets depending on their risk-avoidance.Portfolio 80%.What is the amount of investment in B shares? 4)An investor holds 10 million won. Depending on the degree of risk avoidance, 50% of the funds are borrowed risk-free.After joining, invest all the money in the market portfolio.What is the amount of investment in B shares at that time?