83.93% is the change from 305 to 561
Calculation steps:
[( 561 - 305 ) ÷ 305] x 100 = 83.93%
Formula
Percentage change = [(561 - 305) / 305] x 100
Subtract the new number by the original number
561 - 305 = 256
256 ÷ 305 = 0.839344262295082
0.839344262295082 x 100 = 83.93%