271.08% is the change from 83 to 308
Calculation steps:
[( 308 - 83 ) ÷ 83] x 100 = 271.08%
Formula
Percentage change = [(308 - 83) / 83] x 100
Subtract the new number by the original number
308 - 83 = 225
225 ÷ 83 = 2.710843373493976
2.710843373493976 x 100 = 271.08%