76.74% is the change from 288 to 509
Calculation steps:
[( 509 - 288 ) ÷ 288] x 100 = 76.74%
Formula
Percentage change = [(509 - 288) / 288] x 100
Subtract the new number by the original number
509 - 288 = 221
221 ÷ 288 = 0.7673611111111112
0.7673611111111112 x 100 = 76.74%