According to the calculation of 1000 yuan 50 cents a day, 1800 yuan is the interest of 90 cents a day, which will be known according to the length of time. If the bill is paid on the same day, that is, 0.9 times 30 days is the interest of 27 yuan.

The minimum repayment is, if you use one tenth of the amount, you use 1800 yuan, which means the minimum repayment is 180 yuan.

180 yuan plus your interest,,, that is, the minimum is 207 yuan,, but if you pay less, you are not enough, so in this case, you still have to pay more, and pay 2 10 yuan or 220 yuan for insurance.