121.43% is the change from 280 to 620
Calculation steps:
[( 620 - 280 ) ÷ 280] x 100 = 121.43%
Formula
Percentage change = [(620 - 280) / 280] x 100
Subtract the new number by the original number
620 - 280 = 340
340 ÷ 280 = 1.2142857142857142
1.2142857142857142 x 100 = 121.43%