8400% is the change from 2 to 170
Calculation steps:
[( 170 - 2 ) ÷ 2] x 100 = 8400%
Formula
Percentage change = [(170 - 2) / 2] x 100
Subtract the new number by the original number
170 - 2 = 168
168 ÷ 2 = 84
84 x 100 = 8400%
Example