79.72% is the change from 503 to 904
Calculation steps:
[( 904 - 503 ) ÷ 503] x 100 = 79.72%
Formula
Percentage change = [(904 - 503) / 503] x 100
Subtract the new number by the original number
904 - 503 = 401
401 ÷ 503 = 0.7972166998011928
0.7972166998011928 x 100 = 79.72%