中文：

一分利息公式是指计算利息的一种方式，它是以本金的一定比例来计算利息。在中国，一分利息通常表示每天1%的利息，或者每月30%的利息。

一分利息公式的计算方法很简单。假设本金为P，利率为r，时间为t，那么利息I可以计算为：
I = P × r × t

其中，r是利率，t是时间。通过这个公式，我们可以计算出在一定时间内，本金所产生的利息。

例如，如果本金为100元，利率为每天1%，时间为10天，那么利息I可以计算为：
I = 100 × 0.01 × 10 = 10元。

英文：

The formula for one-cent interest refers to a method of calculating interest by using a certain proportion of the principal as the basis for calculating the interest. In China, one-cent interest typically refers to interest of 1% per day or 30% per month.

The formula for calculating one-cent interest is quite simple. Assuming the principal is P, the interest rate is r, and the time period is t, the interest I can be calculated using the formula:
I = P × r × t

where r is the interest rate and t is the time period. Using this formula, we can calculate the interest generated by the principal within a certain period of time.

For example, if the principal is 100 yuan, the interest rate is 1% per day, and the time period is 10 days, the interest I can be calculated as follows:
I = 100 × 0.01 × 10 = 10 yuan.