291.76% is the change from 170 to 666
Calculation steps:
[( 666 - 170 ) ÷ 170] x 100 = 291.76%
Formula
Percentage change = [(666 - 170) / 170] x 100
Subtract the new number by the original number
666 - 170 = 496
496 ÷ 170 = 2.9176470588235293
2.9176470588235293 x 100 = 291.76%