54.6% is the change from 337 to 521
Calculation steps:
[( 521 - 337 ) ÷ 337] x 100 = 54.6%
Formula
Percentage change = [(521 - 337) / 337] x 100
Subtract the new number by the original number
521 - 337 = 184
184 ÷ 337 = 0.5459940652818991
0.5459940652818991 x 100 = 54.6%