280.95% is the change from 168 to 640
Calculation steps:
[( 640 - 168 ) ÷ 168] x 100 = 280.95%
Formula
Percentage change = [(640 - 168) / 168] x 100
Subtract the new number by the original number
640 - 168 = 472
472 ÷ 168 = 2.8095238095238093
2.8095238095238093 x 100 = 280.95%