15% is the change from 80 to 92
Calculation steps:
[( 92 - 80 ) ÷ 80] x 100 = 15%
Formula
Percentage change = [(92 - 80) / 80] x 100
Subtract the new number by the original number
92 - 80 = 12
12 ÷ 80 = 0.15
0.15 x 100 = 15%
Example