100% is the change from 43 to 86
Calculation steps:
[( 86 - 43 ) ÷ 43] x 100 = 100%
Formula
Percentage change = [(86 - 43) / 43] x 100
Subtract the new number by the original number
86 - 43 = 43
43 ÷ 43 = 1
1 x 100 = 100%
Example