292.59% is the change from 81 to 318
Calculation steps:
[( 318 - 81 ) ÷ 81] x 100 = 292.59%
Formula
Percentage change = [(318 - 81) / 81] x 100
Subtract the new number by the original number
318 - 81 = 237
237 ÷ 81 = 2.925925925925926
2.925925925925926 x 100 = 292.59%