74.65% is the change from 288 to 503
Calculation steps:
[( 503 - 288 ) ÷ 288] x 100 = 74.65%
Formula
Percentage change = [(503 - 288) / 288] x 100
Subtract the new number by the original number
503 - 288 = 215
215 ÷ 288 = 0.7465277777777778
0.7465277777777778 x 100 = 74.65%