275% is the change from 172 to 645
Calculation steps:
[( 645 - 172 ) ÷ 172] x 100 = 275%
Formula
Percentage change = [(645 - 172) / 172] x 100
Subtract the new number by the original number
645 - 172 = 473
473 ÷ 172 = 2.75
2.75 x 100 = 275%
Example