How much do I owe you?
我该付多少钱?
How much do you charge for…?
要卖多少钱?
How much do you ask for it?
这个你要卖多少钱?
How much does it cost?
这个要多少钱?
How much，please?
请问要多少钱?
What do you charge for it?
这个你卖多少钱?
What does it come to?
一共多少钱?
What does it cost?
这个要卖多少钱?
What's it worth?
这值多少钱?