This problem can be solved by calculating the principal and interest of each period. First of all, we need to know that the total repayment amount is 3.34 million and the total principal amount is 3 million, so the total interest amount is 3.34 million-3 million = 340,000.

Then, we can distribute the interest of 340,000 yuan according to the repayment amount of each installment. The specific method is that interest per installment = repayment amount per installment-principal per installment. Principal per period = total principal/total number of periods.

The total number of issues here is 2 years, that is, 24 issues. Therefore, the principal of each installment = 3 million/24 =125,000.

Then we can calculate the interest of each period:

From 1 period to 10 period, the repayment amount of each period is 189500, so the interest of each period =189500-125000 = 37500.

From 1 1 to 16, the repayment amount of each installment is 139000, so the interest of each installment is =139000-125000 =14000.

From 17 to the 24th installment, the repayment amount of each installment is 89,000 yuan, so the interest of each installment = 89,000-125,000 yuan =-36,000 yuan.

In this way, we get the principal and interest of each period. However, it should be noted that the calculation here assumes that the interest is evenly distributed. In fact, in many loans, the interest gradually decreases over time, because the remaining principal will decrease after each repayment. So the specific calculation may need to be determined according to the specific rules of the loan. I hope this answer will help you!