German phrase
Wie viel ~ empfehlen Sie?
Meaning
How much ___ would you recommend?
When to use it
It asks how much to give. Use it politely when asking about tips or other payments.
Example dialogue
Wie viel Trinkgeld empfehlen Sie?
How much of a tip would you recommend?
Fünf bis zehn Prozent sind üblich.
Five to ten percent is usual.