90.49% is the change from 305 to 581
Calculation steps:
[( 581 - 305 ) ÷ 305] x 100 = 90.49%
Formula
Percentage change = [(581 - 305) / 305] x 100
Subtract the new number by the original number
581 - 305 = 276
276 ÷ 305 = 0.9049180327868852
0.9049180327868852 x 100 = 90.49%