145.61% is the change from 171 to 420
Calculation steps:
[( 420 - 171 ) ÷ 171] x 100 = 145.61%
Formula
Percentage change = [(420 - 171) / 171] x 100
Subtract the new number by the original number
420 - 171 = 249
249 ÷ 171 = 1.456140350877193
1.456140350877193 x 100 = 145.61%