50% is the change from 438 to 657
Calculation steps:
[( 657 - 438 ) ÷ 438] x 100 = 50%
Formula
Percentage change = [(657 - 438) / 438] x 100
Subtract the new number by the original number
657 - 438 = 219
219 ÷ 438 = 0.5
0.5 x 100 = 50%
Example