135.4% is the change from 274 to 645
Calculation steps:
[( 645 - 274 ) ÷ 274] x 100 = 135.4%
Formula
Percentage change = [(645 - 274) / 274] x 100
Subtract the new number by the original number
645 - 274 = 371
371 ÷ 274 = 1.354014598540146
1.354014598540146 x 100 = 135.4%