66.78% is the change from 307 to 512
Calculation steps:
[( 512 - 307 ) ÷ 307] x 100 = 66.78%
Formula
Percentage change = [(512 - 307) / 307] x 100
Subtract the new number by the original number
512 - 307 = 205
205 ÷ 307 = 0.6677524429967426
0.6677524429967426 x 100 = 66.78%