If a stock quotes 40 yuan, the stock will not pay dividends within two years; Two-year futures quote 50 yuan. An investor borrows 4000 yuan, with an annual interest rate of 10%.
It means that 40 yuan bought 50 yuan and sold it, and the net profit was (50-40)* 100 shares = 1 000 yuan, but the principal was borrowed, and the interest should be paid back to 4000 * 10% (interest for the first year)+(4000 *10).