67.65% is the change from 306 to 513
Calculation steps:
[( 513 - 306 ) ÷ 306] x 100 = 67.65%
Formula
Percentage change = [(513 - 306) / 306] x 100
Subtract the new number by the original number
513 - 306 = 207
207 ÷ 306 = 0.6764705882352942
0.6764705882352942 x 100 = 67.65%