Question

Change into direct speech
She enquired of him what that house had cost him.

Answer 1

Answer:

She asked him "What was the cost at which you had this house?"

Hope this helps you.

Answer 2

Answer:

She enquired, " What did the house cost you"

Explanation:

When past form is used, use present form in direct speech

When past particles are used, use past form is direct speech.

Hope it helps.