850% is the change from 34 to 323
Calculation steps:
[( 323 - 34 ) ÷ 34] x 100 = 850%
Formula
Percentage change = [(323 - 34) / 34] x 100
Subtract the new number by the original number
323 - 34 = 289
289 ÷ 34 = 8.5
8.5 x 100 = 850%
Example