275.31% is the change from 81 to 304
Calculation steps:
[( 304 - 81 ) ÷ 81] x 100 = 275.31%
Formula
Percentage change = [(304 - 81) / 81] x 100
Subtract the new number by the original number
304 - 81 = 223
223 ÷ 81 = 2.753086419753086
2.753086419753086 x 100 = 275.31%