1310% is the change from 30 to 423
Calculation steps:
[( 423 - 30 ) ÷ 30] x 100 = 1310%
Formula
Percentage change = [(423 - 30) / 30] x 100
Subtract the new number by the original number
423 - 30 = 393
393 ÷ 30 = 13.1
13.1 x 100 = 1310%
Example