2, coal is not easy to control, but also need to have a raw, waste places.

3, first consider sales, then consider the cost. Sell a few more bowls and you're out.

Only 50 bowls a day? A little less!

Even if you make $3 per bowl, how much do you make in a year?

3*50=1500 yuan per month; 12*1500=18000 yuan per year.