Is it permissible to sell a large number of Indian movie tapes, and if not, what should I do with them?

You must hasten to repent from accumulating film tapes. The conditions for repentance are: abandoning the sin, regretting it, and resolving not to return to it, along with sincerity to Allah. It is not permissible to sell these forbidden tapes. If it is possible to record permissible material on them and with them, then there is no harm in selling them at that point. Otherwise, they must be destroyed.