50% is the change from 68 to 102
Calculation steps:
[( 102 - 68 ) ÷ 68] x 100 = 50%
Formula
Percentage change = [(102 - 68) / 68] x 100
Subtract the new number by the original number
102 - 68 = 34
34 ÷ 68 = 0.5
0.5 x 100 = 50%
Example