100% is the change from 430 to 860
Calculation steps:
[( 860 - 430 ) ÷ 430] x 100 = 100%
Formula
Percentage change = [(860 - 430) / 430] x 100
Subtract the new number by the original number
860 - 430 = 430
430 ÷ 430 = 1
1 x 100 = 100%
Example