276.83% is the change from 82 to 309
Calculation steps:
[( 309 - 82 ) ÷ 82] x 100 = 276.83%
Formula
Percentage change = [(309 - 82) / 82] x 100
Subtract the new number by the original number
309 - 82 = 227
227 ÷ 82 = 2.768292682926829
2.768292682926829 x 100 = 276.83%