276.54% is the change from 81 to 305
Calculation steps:
[( 305 - 81 ) ÷ 81] x 100 = 276.54%
Formula
Percentage change = [(305 - 81) / 81] x 100
Subtract the new number by the original number
305 - 81 = 224
224 ÷ 81 = 2.765432098765432
2.765432098765432 x 100 = 276.54%