The annual interest rate is 2.64%. The monthly interest rate of 2.2% is 0.22%, and the converted annual interest rate is 0.22%* 12=2.64%, which is equivalent to borrowing 10000 yuan, and the interest for one month is 10000*0.22%=22 yuan. Interest is the use fee of money in a certain period of time, and it refers to the reward that money holders (creditors) get from borrowers (debtors) for lending money or monetary capital. Including deposit interest, loan interest and interest generated by various bonds.