50.15% is the change from 335 to 503
Calculation steps:
[( 503 - 335 ) ÷ 335] x 100 = 50.15%
Formula
Percentage change = [(503 - 335) / 335] x 100
Subtract the new number by the original number
503 - 335 = 168
168 ÷ 335 = 0.5014925373134328
0.5014925373134328 x 100 = 50.15%