How much is a reasonable salary to buy breakfast for people on a part-time basis?

I remember reading a report that there was a poor boy in college who bought breakfast for others every day. A breakfast 1 yuan, 8 people bought a dormitory at a time, and 40 people ran to 5 dormitories. 30 yuan is a good income and you can buy it in an hour. Of course, it depends on the distance and the time of the whole process.

Think for yourself, of course, 1 yuan is reasonable, too high is not good, small profits but quick turnover, and your business is good.

If I had known this in college, I would have done so.