Price per square centimeter of big sesame seed cake: 8÷200.96≈0.04 (jiao);
Area of small sesame seed cake: 3.14× (122) 2 =113.04 (square centimeter),
The price of sesame seed cake per square centimeter: 6÷ 1 13.04≈0.05 (jiao);
Because of the angle of 0.04 < 0.05, it is cost-effective to buy big biscuits;
A: It is cost-effective to buy big biscuits, so after a while, more and more people buy big biscuits and fewer and fewer people buy small biscuits.