Be Wise or Face the consequences at ordering at Tze Char Stall

Stall A (Coffee shop at Lor 4 Toa Payoh):
Vegetables dishes are sold at $6 (S) and $9 (M)
Claypot Tofu dishes are sold at $8 (S) and $12 (M)
Meat dishes are sold at $8 (S) and $12 (M)
Fish dishes are sold at $8 (S) and $12 (M)
Vegetable Luo Han Zai at $7 (S) and $9 (M)

Stall B (Coffee shop at Toa Payoh Central):
Vegetables dishes are sold at $7 (S) and $9 (M)
Claypot Tofu dishes are sold at $12 (S) and $16 (M)
Meat dishes are sold at $8 (S) and $12 (M)
Fish dishes are sold at $9 (S) and $14 (M)
Vegetable Luo Han Zai at $8 (S) and $10 (M)

Dinner for 4pax (non-vegetarian) + 1pax (vegetarian):
Dishes: Claypot tofu, Kailan, Fish and Luo Han Zai

Menu 1: order all 4 Small dishes instead of Medium dishes at Stall A saves you $14

Menu 2: order all 4 Medium dishes
Result: 1 dish untouched and 0.25 dish unfinished