80% is the change from 30 to 54
Calculation steps:
[( 54 - 30 ) ÷ 30] x 100 = 80%
Formula
Percentage change = [(54 - 30) / 30] x 100
Subtract the new number by the original number
54 - 30 = 24
24 ÷ 30 = 0.8
0.8 x 100 = 80%
Example