There are two steps to this question the first is finding out what is 1% of 64000, which can be found using the equation, 64,000/100 which will tell us that 1% of 64000 is 640. After this, we can multiply this 640 by 80 (640*80) to find 80% of 64,000 which comes out 51,200.
So of the 64,000 people in attendance, 51,200 supported the home team.