Spanish phrase
¿Cuánto cuesta cada uno si llevo ~?
Meaning
How much does each item cost if I buy ___?
When to use it
Requests the unit cost when purchasing a stated quantity. Common in shops to check per-unit price or discounts when naming a quantity.
Example dialogue
¿Cuánto cuesta cada uno si llevo una docena?
How much does each item cost if I buy a dozen?
Si llevas una docena, salen a 2 euros cada una.
If you buy a dozen, they cost 2 euros each.