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QUICK ANSWER
"Cuánto es" is a form of "cuánto es", a phrase which is often translated as "how much it is". "Por favor" is a phrase which is often translated as "please". Learn more about the difference between "por favor" and "cuánto es" below.
por favor()
A phrase is a group of words commonly used together (e.g., once upon a time).
cuánto es()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. how much it is
Si me dices cuánto es, te lo pago, que tengo un poco de prisa.Can you please tell me how much it is, so that I can pay you? I'm in a bit of a hurry.
a. how much is
¿Cuánto es el zumo de naranja? - Tres euros.How much is the orange juice? - Three euros.