57.7% is the change from 305 to 481
Calculation steps:
[( 481 - 305 ) ÷ 305] x 100 = 57.7%
Formula
Percentage change = [(481 - 305) / 305] x 100
Subtract the new number by the original number
481 - 305 = 176
176 ÷ 305 = 0.5770491803278689
0.5770491803278689 x 100 = 57.7%