3.45% is the change from 580 to 600
Calculation steps:
[( 600 - 580 ) ÷ 580] x 100 = 3.45%
Formula
Percentage change = [(600 - 580) / 580] x 100
Subtract the new number by the original number
600 - 580 = 20
20 ÷ 580 = 0.034482758620689655
0.034482758620689655 x 100 = 3.45%