2. Coal is difficult to control, and raw materials and waste materials are needed.

3. Consider the sales volume first, then the cost. Sell a few more bowls and it will come out.

Only 50 bowls a day? Less!

Even if you earn 3 yuan per bowl, how much do you earn a year?

3*50= 1500 yuan per month; Every year12 *1500 =18000 yuan.