65.15% is the change from 307 to 507
Calculation steps:
[( 507 - 307 ) ÷ 307] x 100 = 65.15%
Formula
Percentage change = [(507 - 307) / 307] x 100
Subtract the new number by the original number
507 - 307 = 200
200 ÷ 307 = 0.6514657980456026
0.6514657980456026 x 100 = 65.15%