NET

19 Large numbers of those who had practiced magic collected their books and burned them up in the presence of everyone. When the value of the books was added up, it was found to total 50,000 silver coins.

Darby

19 And many of those that practised curious arts brought their books [of charms] and burnt them before all. And they reckoned up the prices of them, and found it fifty thousand pieces of silver.

KJV

19 Many of them also which used curious arts brought their books together, and burned them before all [men]: and they counted the price of them, and found [it] fifty thousand [pieces] of silver.