68.63% is the change from 306 to 516
Calculation steps:
[( 516 - 306 ) ÷ 306] x 100 = 68.63%
Formula
Percentage change = [(516 - 306) / 306] x 100
Subtract the new number by the original number
516 - 306 = 210
210 ÷ 306 = 0.6862745098039216
0.6862745098039216 x 100 = 68.63%