1000% is the change from 39 to 429
Calculation steps:
[( 429 - 39 ) ÷ 39] x 100 = 1000%
Formula
Percentage change = [(429 - 39) / 39] x 100
Subtract the new number by the original number
429 - 39 = 390
390 ÷ 39 = 10
10 x 100 = 1000%
Example