Repay the principal and interest of commercial loans every _ _ _ years, calculated according to the equal principal and interest, with monthly repayment amount = monthly repayment amount principal and interest =1interest paid in October = loan amount ÷ total loan period = loan amount x monthly interest rate. The loan amount is 2.4 million yuan, the total loan period is 30 years x 12/ year =360, and the monthly loan interest rate is 0.5%. Monthly payment = 2.4 million yuan ÷ 3.60+2.4 million yuan _0.5%=0.666667 million yuan1.2000 yuan = 1.86667 million yuan =186666.67 yuan.