200% is the change from 10 to 30
Calculation steps:
[( 30 - 10 ) ÷ 10] x 100 = 200%
Formula
Percentage change = [(30 - 10) / 10] x 100
Subtract the new number by the original number
30 - 10 = 20
20 ÷ 10 = 2
2 x 100 = 200%
Example