397.04% is the change from 135 to 671
Calculation steps:
[( 671 - 135 ) ÷ 135] x 100 = 397.04%
Formula
Percentage change = [(671 - 135) / 135] x 100
Subtract the new number by the original number
671 - 135 = 536
536 ÷ 135 = 3.9703703703703703
3.9703703703703703 x 100 = 397.04%