200% is the change from 21 to 63
Calculation steps:
[( 63 - 21 ) ÷ 21] x 100 = 200%
Formula
Percentage change = [(63 - 21) / 21] x 100
Subtract the new number by the original number
63 - 21 = 42
42 ÷ 21 = 2
2 x 100 = 200%
Example