The 10% of the number 580 is obtained by multiplying by 10 and dividing by 100:
[tex]580\cdot\frac{10}{100}=\frac{580\cdot10}{100}=\frac{5800}{100}=58.[/tex]If we increase the number 580 by a 10% percent, we are increasing the number by 58. So the amount of increase is 58.
Answer: 58
