69.64% is the change from 280 to 475
Calculation steps:
[( 475 - 280 ) ÷ 280] x 100 = 69.64%
Formula
Percentage change = [(475 - 280) / 280] x 100
Subtract the new number by the original number
475 - 280 = 195
195 ÷ 280 = 0.6964285714285714
0.6964285714285714 x 100 = 69.64%