97.7% is the change from 305 to 603
Calculation steps:
[( 603 - 305 ) ÷ 305] x 100 = 97.7%
Formula
Percentage change = [(603 - 305) / 305] x 100
Subtract the new number by the original number
603 - 305 = 298
298 ÷ 305 = 0.9770491803278688
0.9770491803278688 x 100 = 97.7%