187.5% is the change from 280 to 805
Calculation steps:
[( 805 - 280 ) ÷ 280] x 100 = 187.5%
Formula
Percentage change = [(805 - 280) / 280] x 100
Subtract the new number by the original number
805 - 280 = 525
525 ÷ 280 = 1.875
1.875 x 100 = 187.5%
Example