52.34% is the change from 342 to 521
Calculation steps:
[( 521 - 342 ) ÷ 342] x 100 = 52.34%
Formula
Percentage change = [(521 - 342) / 342] x 100
Subtract the new number by the original number
521 - 342 = 179
179 ÷ 342 = 0.5233918128654971
0.5233918128654971 x 100 = 52.34%