83.1% is the change from 503 to 921
Calculation steps:
[( 921 - 503 ) ÷ 503] x 100 = 83.1%
Formula
Percentage change = [(921 - 503) / 503] x 100
Subtract the new number by the original number
921 - 503 = 418
418 ÷ 503 = 0.831013916500994
0.831013916500994 x 100 = 83.1%