283.56% is the change from 73 to 280
Calculation steps:
[( 280 - 73 ) ÷ 73] x 100 = 283.56%
Formula
Percentage change = [(280 - 73) / 73] x 100
Subtract the new number by the original number
280 - 73 = 207
207 ÷ 73 = 2.835616438356164
2.835616438356164 x 100 = 283.56%