221.43% is the change from 280 to 900
Calculation steps:
[( 900 - 280 ) ÷ 280] x 100 = 221.43%
Formula
Percentage change = [(900 - 280) / 280] x 100
Subtract the new number by the original number
900 - 280 = 620
620 ÷ 280 = 2.2142857142857144
2.2142857142857144 x 100 = 221.43%