1. Just guess that she is 50 a day and then a month 1500. How can spending money be so quantified? More or less possible.

She can work part-time. Isn't it easy to pay 500 yuan a month?

It is normal for girls to spend more than boys a month 1500. To make a bad analogy, they always change underwear and stockings more diligently than men, not to mention sanitary napkins.