All are natural? Or how would you say?
(someone bought something new and I wonder how he paid for it)

How did you buy it?
With what money did you buy it?
Where did you find the money to buy it?
How did you afford it?

Question

All are natural? Or how would you say?
(someone bought something new and I wonder how he paid for it)

How did you buy it?
With what money did you buy it?
Where did you find the money to buy it?
How did you afford it?

Answer

They're all correct, but the second one sounds strangely formal.