Van Persie enjoyed a wonderful first season at the club as helped United to their 20th league title.
Robin Van Persie signs for Manchester United
This was a classic case of Sir Alex Ferguson identifying which one player would win Manchester United the league. He saw Robin Van Persie have an excellent season at Arsenal and was prepared to pay £24 million to buy him, according to BBC Sport. After losing the title to Manchester City on goal difference, Ferguson went out and bought more goals to ensure that wouldn't happen again.
In the 2011/12 season he managed to score 30 goals in 37 Premier League games - in all competitions he made it 37 goals from 48 appearances, a pretty astonishing strike rate.
26 goals in the league for Manchester United would win him the golden boot as he found the net on 30 occasions in all competitions - fittingly scoring a hat-trick in the game that would clinch United the title against Aston Villa in April of that season.
Robin Van Persie with Sir Alex Ferguson
That's not to say United didn't have the firepower the previous season as Wayne Rooney was in fine form having scored 34 goals from 43 games in all competitions.
But with the Dutchman they had someone who was turning around games for them earlier on in the season and scoring winning goals. Southampton away where they twice trailed stands out as Van Persie scored a hat-trick in a 3-2 win, as well as his performance against Manchester City which helped land an early blow in the title race. He scored in 16 of his first 26 league games for the club as they opened up a substantial lead ahead of the chasing pack. The transfer fee could be considered repaid in full.
Robin Van Persie celebrates v Man City
The damage was done. Though his Manchester United career following the departure of Sir Alex Ferguson went much the same way as the club, his title winning season at the club alone meant his signing was worth what was paid for just for that season.
Van Persie's signing was a lesson in if you bring more goals into your side, the chances are you can improve over the course of a season.
Robin Van Persie with Premier League trophy