en_tn_condensed/act/16/19.md

her masters

"the owners of the slave girl"

their hope of profit was now gone

"their opportunity to make money was now gone" or "they could no longer expect to make money"

their hope of profit was now gone

"she could no longer earn money for them by telling fortunes"

into the marketplace

"into the public square." This is a public place of business, where buying and selling of goods, cattle, or services takes place.

before the authorities

"into the presence of the authorities" or "so that the authorities could judge them"