51.6% is the change from 343 to 520
Calculation steps:
[( 520 - 343 ) ÷ 343] x 100 = 51.6%
Formula
Percentage change = [(520 - 343) / 343] x 100
Subtract the new number by the original number
520 - 343 = 177
177 ÷ 343 = 0.5160349854227405
0.5160349854227405 x 100 = 51.6%