81% is the change from 279 to 505
Calculation steps:
[( 505 - 279 ) ÷ 279] x 100 = 81%
Formula
Percentage change = [(505 - 279) / 279] x 100
Subtract the new number by the original number
505 - 279 = 226
226 ÷ 279 = 0.8100358422939068
0.8100358422939068 x 100 = 81%