76.49% is the change from 285 to 503
Calculation steps:
[( 503 - 285 ) ÷ 285] x 100 = 76.49%
Formula
Percentage change = [(503 - 285) / 285] x 100
Subtract the new number by the original number
503 - 285 = 218
218 ÷ 285 = 0.7649122807017544
0.7649122807017544 x 100 = 76.49%