The figure thats been thrown around by shipping companies is 2 million dollars, or around 10% toll. Read an analysis which said that with around 2 billion dollars of value flowing through the strait every day, this rate is basically enough to completely offset the economic sanctions. So far thai, chinese, greek and some other countries vessels have been allowed to pass. American or Israel affiliated ones are excluded though.

This is also why France and Germany are in talks directly with Tehran allegedly.

They said they're demanding that oil be traded using other currencies than the dollar, but I'm not sure about this vessel in particular.