291.36% is the change from 81 to 317
Calculation steps:
[( 317 - 81 ) ÷ 81] x 100 = 291.36%
Formula
Percentage change = [(317 - 81) / 81] x 100
Subtract the new number by the original number
317 - 81 = 236
236 ÷ 81 = 2.9135802469135803
2.9135802469135803 x 100 = 291.36%