18.37% is the change from 490 to 580
Calculation steps:
[( 580 - 490 ) ÷ 490] x 100 = 18.37%
Formula
Percentage change = [(580 - 490) / 490] x 100
Subtract the new number by the original number
580 - 490 = 90
90 ÷ 490 = 0.1836734693877551
0.1836734693877551 x 100 = 18.37%