68.63% is the change from 51 to 86
Calculation steps:
[( 86 - 51 ) ÷ 51] x 100 = 68.63%
Formula
Percentage change = [(86 - 51) / 51] x 100
Subtract the new number by the original number
86 - 51 = 35
35 ÷ 51 = 0.6862745098039216
0.6862745098039216 x 100 = 68.63%