Mandingo's box office gross
I did some digging on the net. I found out that "Mandingo" cost 5 million dollars to make. And grossed over 25 million dollars at the US box office in 1975. That was a big hit back in 1975, for a movie to gross over 25 million dollars.
No movie had ever grossed 100 million dollars, until "Jaws" came out the same summer as "Mandingo", 1975. "Jaws" rised the bar for every movie since it's release in 1975. But "Mandingo" held it's own, going in the books as one of the highest grossing films of the year 1975.