Acabamos de comprar tres bolsas por 480 pesos. ¿encontraron el restaurante? esta falda azul es muy elegante. le doy un muy buen precio. mira, son cuatro. roja, amarilla, blanca, azul. acabo de ver una bolsa igual a ésta que cuesta 30 pesos menos.

Girl1: Mira, son cuatro. Roja, amarilla, blanca, azul.  

Girl2: Esta falda azul es muy elegante.  

Salesman: Le doy un muy buen precio.

Girl2: Acabamos de comprar tres bolsas por 480 pesos.  

Girl1: Acabo de ver una bolsa igual a ésta que cuesta 30 pesos menos.  

Girl1: ¿Encontraron el restaurante?  

Explanation:

We need to imagine that this situation is a conversation that is acctually executing in a store or mall. Where there is a girl who is shopping a skirt and a girlfriend arrived at the same place and tell she bought some plastic bags and the girl who is buying a skirt ask whether she found the restarurant where they both are goning to have a meal.

answer might be "si", would be better if you added answer choices

corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.

your best bet would be corras, it's the only one that is informal but is still wrong