290.12% is the change from 81 to 316
Calculation steps:
[( 316 - 81 ) ÷ 81] x 100 = 290.12%
Formula
Percentage change = [(316 - 81) / 81] x 100
Subtract the new number by the original number
316 - 81 = 235
235 ÷ 81 = 2.9012345679012346
2.9012345679012346 x 100 = 290.12%