LOS ANGELES — Neither a hyper intelligent robot nor Vince Vaughn could save the box office this weekend, which is down 38.5 percent from the same weekend last year according to Sunday estimates from box office firm Rentrak.

While Neill Blomkamp’s R-rated “Chappie” might have taken the No. 1 spot in its 3,201 theater debut, its modest $13.3 million gross is hardly anything to celebrate.

The R-rated Vince Vaughn comedy “Unfinished Business” fared even worse, opening at No. 10 to a dismal $4.8 million. The $35 million film about a chaotic European business trip also stars Dave Franco and Tom Wilkinson.

In its second weekend in theaters, Will Smith’s “Focus” fell an estimated 46 percent to take second place with $10 million, bringing its domestic total to $34.6 million.

One bright spot was Fox Searchlight’s retiree comedy “The Second Best Exotic Marigold Hotel,” which opened in third place with a strong $8.6 million from 1,573 locations.

Holdovers “Kingsman: The Secret Service” and “The SpongeBob Movie: Sponge Out of Water,” rounded out the top five with $8.3 million and $7 million, respectively.

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters.

1. “Chappie,” $13.3 million

2. “Focus,” $10 million

3. “The Second Best Exotic Marigold Hotel,” $8.6 million

4. “Kingsman: The Secret Service,” $8.3 million

5. “The SpongeBob Movie: Sponge Out of Water,” $7 million

6. “Fifty Shades of Grey,” $5.6 million

7. “McFarland, USA,” $5.3 million

8. “The Lazarus Effect,” $5.1 million

9. “The DUFF,” $4.9 million.

10. “Unfinished Business,” $4.8 million.