48.4% is the change from 343 to 509
Calculation steps:
[( 509 - 343 ) ÷ 343] x 100 = 48.4%
Formula
Percentage change = [(509 - 343) / 343] x 100
Subtract the new number by the original number
509 - 343 = 166
166 ÷ 343 = 0.4839650145772595
0.4839650145772595 x 100 = 48.4%