51.45% is the change from 344 to 521
Calculation steps:
[( 521 - 344 ) ÷ 344] x 100 = 51.45%
Formula
Percentage change = [(521 - 344) / 344] x 100
Subtract the new number by the original number
521 - 344 = 177
177 ÷ 344 = 0.5145348837209303
0.5145348837209303 x 100 = 51.45%