How much does this necklace cost?
A: I want to buy a necklace for my girlfriend.
B: Which one do you like?
A: Please show me that one. How much does it cost?
B: It costs 400 dollars.
How much are these?
A: Please show me some notebooks and a pen.
B: Here you are, Anything else?
A: No, thank you. How much are these, please?
B: That will be 3.5 dollars.
How much is it altogether?
What's the price?
How much are you asking for this?