80% is the change from 155 to 279
Calculation steps:
[( 279 - 155 ) ÷ 155] x 100 = 80%
Formula
Percentage change = [(279 - 155) / 155] x 100
Subtract the new number by the original number
279 - 155 = 124
124 ÷ 155 = 0.8
0.8 x 100 = 80%
Example