67.76% is the change from 304 to 510
Calculation steps:
[( 510 - 304 ) ÷ 304] x 100 = 67.76%
Formula
Percentage change = [(510 - 304) / 304] x 100
Subtract the new number by the original number
510 - 304 = 206
206 ÷ 304 = 0.6776315789473685
0.6776315789473685 x 100 = 67.76%