27.5% is the change from 80 to 102
Calculation steps:
[( 102 - 80 ) ÷ 80] x 100 = 27.5%
Formula
Percentage change = [(102 - 80) / 80] x 100
Subtract the new number by the original number
102 - 80 = 22
22 ÷ 80 = 0.275
0.275 x 100 = 27.5%
Example