How many per cent of the tickets were sold for Justin Bieber's concert at Estádio Beira in October 2011?

Explanation

Justin's "My World Tour" encompassed 130 concerts, of which the majority were completely sold out. But when he performed at Estádio Beira in Brasil on 10 October 2011, only 43 per cent of the seats were filled. This might seem like a flop when comparing with his other concerts, but it wasn't all that bad. The arena is huge, and 48,675 tickets were put up for sale, of which 20,698 were sold. Thus, 43% of all tickets were sold.