Number of stores | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
Si (piece) | 550 | 580 | 480 | 460 | 520 | 500 | 540 |
si (piece) | 50 | 60 | 55 | 40 | 50 | 55 | 45 |
(yuan/piece) | 3 | 4 | 3 | 5 | 5 | 4 | 3 |
Li (day) | 2 | 1.5 | 2.5 | 2 | 1.5 | 1.5 | 2 |
mi (piece) | 55 | 80 | 60 | 70 | 60 | 50 | 65 |