45.38% is the change from 346 to 503
Calculation steps:
[( 503 - 346 ) ÷ 346] x 100 = 45.38%
Formula
Percentage change = [(503 - 346) / 346] x 100
Subtract the new number by the original number
503 - 346 = 157
157 ÷ 346 = 0.45375722543352603
0.45375722543352603 x 100 = 45.38%