100% is the change from 435 to 870
Calculation steps:
[( 870 - 435 ) ÷ 435] x 100 = 100%
Formula
Percentage change = [(870 - 435) / 435] x 100
Subtract the new number by the original number
870 - 435 = 435
435 ÷ 435 = 1
1 x 100 = 100%
Example