147.06% is the change from 170 to 420
Calculation steps:
[( 420 - 170 ) ÷ 170] x 100 = 147.06%
Formula
Percentage change = [(420 - 170) / 170] x 100
Subtract the new number by the original number
420 - 170 = 250
250 ÷ 170 = 1.4705882352941178
1.4705882352941178 x 100 = 147.06%