1990% is the change from 10 to 209
Calculation steps:
[( 209 - 10 ) ÷ 10] x 100 = 1990%
Formula
Percentage change = [(209 - 10) / 10] x 100
Subtract the new number by the original number
209 - 10 = 199
199 ÷ 10 = 19.9
19.9 x 100 = 1990%
Example