135.9% is the change from 273 to 644
Calculation steps:
[( 644 - 273 ) ÷ 273] x 100 = 135.9%
Formula
Percentage change = [(644 - 273) / 273] x 100
Subtract the new number by the original number
644 - 273 = 371
371 ÷ 273 = 1.358974358974359
1.358974358974359 x 100 = 135.9%