According to the police, the men first demanded Rs 5,100 and a mobile phone from her as a "penalty" because her friend was a "non-tribal" and then allegedly forced the girl and her boyfriend to strip and have sex in front of them, before taking turns to rape her.
Dumka Superintendent of Police Mayur Patel said 16 people have been arrested on the basis of inputs given by the girl and her friend.
The men demanded Rs 4,000 and a mobile phone from her as a penalty for roaming with a non-tribal. Her boyfriend refused to hand over the mobile and assured them of giving them the money if he was permitted to call his friend.
But the culprits snatched her mobile phone and instead asked their friends to come to the spot, the police said.
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After the crime, the accused forced the girl to wash herself in a nearby pond and handed her over to her boyfriend without her clothes, the police said.
The girl and her friend contacted their friends and relatives and reached Muffassil police station at around 11.30 pm that night and lodged a gangrape case, the police said.
The girl was sent to Sadar Hospital, where her condition was stated to be 'out of danger', the police said.
While the girl is a native of Dumka, her friend is employed in Kolkata.
Search is on for one more accused, the SP, said adding a named FIR has been filed against against eight persons and several unknown persons.