50% is the change from 664 to 996
Calculation steps:
[( 996 - 664 ) ÷ 664] x 100 = 50%
Formula
Percentage change = [(996 - 664) / 664] x 100
Subtract the new number by the original number
996 - 664 = 332
332 ÷ 664 = 0.5
0.5 x 100 = 50%
Example