1043.33% is the change from 30 to 343
Calculation steps:
[( 343 - 30 ) ÷ 30] x 100 = 1043.33%
Formula
Percentage change = [(343 - 30) / 30] x 100
Subtract the new number by the original number
343 - 30 = 313
313 ÷ 30 = 10.433333333333334
10.433333333333334 x 100 = 1043.33%