There is a gross profit. One pound of glutinous rice can make 1.2 pounds of rice, which can be made into four rice balls of at least 3 taels, which can be sold for 12 yuan.

In this way, the gross profit is 12 yuan - 3 yuan = 9 yuan.

Deduct labor, water, electricity, and rent. How much more is there to earn? Then analyze it yourself.