Translation: ¿A cuánto se suma la cuenta?
While this is an accurate translation, it is not commonly used in Spanish. A more natural idiomatic expression would be "¿Cuánto le debo?" which means "How much do I owe you?"
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Basically: El dinero, por favor (The money, please)
But it depends on who you are, who you're asking for money, your relationship(s), etc., etc. You'd say it differently if you were begging on the street, soliciting for a charity, seeking a loan from your bank-manager, etc., etc.