300,000 years is 60 periods, and a total of 372,000 yuan has been paid back. 60 issues are still full, 6000 yuan per issue, 60 issues of 200 yuan.

To pay back 372 thousand. The monthly handling fee of CCB is 0.4%. One month's interest is 1200, five years is 60 installments, and 60 times of 1200 is 72,000, and 72,000 plus 300,000 equals 372,000, making a total of 372,000.

He can repay in advance, 1 installment is not equal to 30 days. You can repay the loan the day before the final repayment date. You can ask customer service about this.