The interest of 50,000.7 jiao belongs to the category of high interest rate, which is generally understood as: the interest for one day is 166.66 yuan.

The calculation method is as follows:

10000 yuan a month's interest is 700 yuan.

50,000 yuan with a monthly interest of 3,500 yuan.

A month is 30 days, so the interest for one day is 166.66 yuan.