100% is the change from 32 to 64
Calculation steps:
[( 64 - 32 ) ÷ 32] x 100 = 100%
Formula
Percentage change = [(64 - 32) / 32] x 100
Subtract the new number by the original number
64 - 32 = 32
32 ÷ 32 = 1
1 x 100 = 100%
Example