400% is the change from 134 to 670
Calculation steps:
[( 670 - 134 ) ÷ 134] x 100 = 400%
Formula
Percentage change = [(670 - 134) / 134] x 100
Subtract the new number by the original number
670 - 134 = 536
536 ÷ 134 = 4
4 x 100 = 400%
Example