60% is the change from 305 to 488
Calculation steps:
[( 488 - 305 ) ÷ 305] x 100 = 60%
Formula
Percentage change = [(488 - 305) / 305] x 100
Subtract the new number by the original number
488 - 305 = 183
183 ÷ 305 = 0.6
0.6 x 100 = 60%
Example