The interest generated by the bill on March 20th will be settled to the bill on April 20th, and will be repaid in the next installment. If you pay back the principal (that is, 3382.57-2000), the interest will stop.

Calculation of interest: If you spend all your money without withdrawing it, then if you don't pay it in full on April 9, the interest will be calculated according to the full amount in the billing cycle. That is to say, during the billing period from February 2/kloc-0 to March 20, the daily interest will be charged at the rate of five ten thousandths of the consumption amount until it is paid off, with the minimum charge of 1 yuan at the time of checkout.

The day when you paid back 2000 is a demarcation point. From 3382.57 to 2000, the interest was calculated at 3382.57, and from 2000 to the end of the year, the interest was calculated at 1382.57.

In fact, the first two answers are the same, except that they write formulas and I write explanations.

I hope it helps!