2.5% is the change from 80 to 82
Calculation steps:
[( 82 - 80 ) ÷ 80] x 100 = 2.5%
Formula
Percentage change = [(82 - 80) / 80] x 100
Subtract the new number by the original number
82 - 80 = 2
2 ÷ 80 = 0.025
0.025 x 100 = 2.5%
Example