312.2% is the change from 82 to 338
Calculation steps:
[( 338 - 82 ) ÷ 82] x 100 = 312.2%
Formula
Percentage change = [(338 - 82) / 82] x 100
Subtract the new number by the original number
338 - 82 = 256
256 ÷ 82 = 3.1219512195121952
3.1219512195121952 x 100 = 312.2%