According to 1 Chronicles, how much did David pay Ornan for the threshing floor site?

Answer: 600 shekels of gold

David insisted on full price, paid Ornan 600 shekels of gold for the site, and built an altar there to the LORD.

“So David paid Ornan six hundred shekels of gold for the site.”— 1 Chronicles 21:25 (BSB)