200% is the change from 64 to 192
Calculation steps:
[( 192 - 64 ) ÷ 64] x 100 = 200%
Formula
Percentage change = [(192 - 64) / 64] x 100
Subtract the new number by the original number
192 - 64 = 128
128 ÷ 64 = 2
2 x 100 = 200%
Example