54.14% is the change from 338 to 521
Calculation steps:
[( 521 - 338 ) ÷ 338] x 100 = 54.14%
Formula
Percentage change = [(521 - 338) / 338] x 100
Subtract the new number by the original number
521 - 338 = 183
183 ÷ 338 = 0.5414201183431953
0.5414201183431953 x 100 = 54.14%