258.24% is the change from 170 to 609
Calculation steps:
[( 609 - 170 ) ÷ 170] x 100 = 258.24%
Formula
Percentage change = [(609 - 170) / 170] x 100
Subtract the new number by the original number
609 - 170 = 439
439 ÷ 170 = 2.5823529411764707
2.5823529411764707 x 100 = 258.24%