Second, you need to pay 321* 0.88+26 * 0.5+6 = 301.48.

Critical value:

Suppose you eat a total of X yuan, and the yellow disc is assumed to be 13. Then, when the two algorithms are equal, it is:

0.85x=(x-26)*0.88+26*0.5

The critical value is 329.33 yuan.