Monthly repayment amount = installment amount/total number of installments+installment amount *0.54%
That is, the monthly repayment amount = 6000/18+6000 * 0.54% = 365.73 yuan.
Total repayment =365.73 yuan * 18 yuan =6583. 14 yuan, 583 yuan more than the original 6000 yuan.14 yuan.