42.49% is the change from 353 to 503
Calculation steps:
[( 503 - 353 ) ÷ 353] x 100 = 42.49%
Formula
Percentage change = [(503 - 353) / 353] x 100
Subtract the new number by the original number
503 - 353 = 150
150 ÷ 353 = 0.42492917847025496
0.42492917847025496 x 100 = 42.49%