100% is the change from 490 to 980
Calculation steps:
[( 980 - 490 ) ÷ 490] x 100 = 100%
Formula
Percentage change = [(980 - 490) / 490] x 100
Subtract the new number by the original number
980 - 490 = 490
490 ÷ 490 = 1
1 x 100 = 100%
Example