56.36% is the change from 55 to 86
Calculation steps:
[( 86 - 55 ) ÷ 55] x 100 = 56.36%
Formula
Percentage change = [(86 - 55) / 55] x 100
Subtract the new number by the original number
86 - 55 = 31
31 ÷ 55 = 0.5636363636363636
0.5636363636363636 x 100 = 56.36%