153.61% is the change from 166 to 421
Calculation steps:
[( 421 - 166 ) ÷ 166] x 100 = 153.61%
Formula
Percentage change = [(421 - 166) / 166] x 100
Subtract the new number by the original number
421 - 166 = 255
255 ÷ 166 = 1.536144578313253
1.536144578313253 x 100 = 153.61%