How much does the hat cost?
It costs 5,000 won.
What is the price of the hat?
It is 5,000 won.
How much is the hat?
It is 5,000 won.
How much do I have to pay for the hat?
I have to pay 5,000 won (for it).
How much do I owe you for the hat?
I have to owe 5,000 won for it.
(Are the answers and questions all correct?)
All look good except the very last answer. It should be ...
How much do I owe you for the hat?
5,000 won.