The monthly interest rate of 2.2% is equal to the annualized interest rate of 2.64%. Because 2.2% is the calculation method of private lending, which is equivalent to 0.0022, and 0.0022 is equal to 0.22%. Using the conversion relationship of interest rates, the annual interest rate = monthly interest rate multiplied by 12= daily interest rate multiplied by 360, and substituting it into the calculation formula, it is found that the annual interest rate equals 0.22% multiplied by 12 equals 2.64%. Therefore, the equal monthly interest of 2.2% is equal to the annualized rate of 2.64%.