I personally support the interest algorithm mentioned by yipengshuai1:
Interest = total repayment amount (2436*12*10=¥292320 yuan) - loan amount (¥210000 yuan) = ¥ 82,320 yuan.
If you want to calculate the annual interest rate of the loan, apply the common stock annuity present value formula PV = A * 1 - (1 i) ^ (-n) / i
That is: 210000 = 2436 * 1 - (1 i) ^(-n)/i
Use interpolation method to find i. Note that i is just the monthly interest rate. Multiply by 12 to get the annual interest rate I ≈ 0.069789462658 ≈ 6.98
Reference:
Annuity present value/wiki/E5B9B4E98791E78EB0E580BC
Interpolation method (interpolation method) /wiki/E58685E68F92E6B395