50% is the change from 338 to 507
Calculation steps:
[( 507 - 338 ) ÷ 338] x 100 = 50%
Formula
Percentage change = [(507 - 338) / 338] x 100
Subtract the new number by the original number
507 - 338 = 169
169 ÷ 338 = 0.5
0.5 x 100 = 50%
Example