70.38% is the change from 503 to 857
Calculation steps:
[( 857 - 503 ) ÷ 503] x 100 = 70.38%
Formula
Percentage change = [(857 - 503) / 503] x 100
Subtract the new number by the original number
857 - 503 = 354
354 ÷ 503 = 0.7037773359840954
0.7037773359840954 x 100 = 70.38%