4150% is the change from 8 to 340
Calculation steps:
[( 340 - 8 ) ÷ 8] x 100 = 4150%
Formula
Percentage change = [(340 - 8) / 8] x 100
Subtract the new number by the original number
340 - 8 = 332
332 ÷ 8 = 41.5
41.5 x 100 = 4150%
Example