64.5% is the change from 307 to 505
Calculation steps:
[( 505 - 307 ) ÷ 307] x 100 = 64.5%
Formula
Percentage change = [(505 - 307) / 307] x 100
Subtract the new number by the original number
505 - 307 = 198
198 ÷ 307 = 0.6449511400651465
0.6449511400651465 x 100 = 64.5%