The given transaction tax is 0.3%, brokerage fees are 0.1425%, securities lending fees are 0.1%, and self-provided funds are 60% The margin for securities lending is 90%, the financing interest rate is 5%, and the interest rate for securities lending is 1%. If you buy 10 A shares, you can sell them at 9 yuan per share in half a year. What is the rate of return of a certain A?