100% is the change from 324 to 648
Calculation steps:
[( 648 - 324 ) ÷ 324] x 100 = 100%
Formula
Percentage change = [(648 - 324) / 324] x 100
Subtract the new number by the original number
648 - 324 = 324
324 ÷ 324 = 1
1 x 100 = 100%
Example