-20.23% is the change from 351 to 280
Calculation steps:
[( 280 - 351 ) ÷ 351] x 100 = -20.23%
Formula
Percentage change = [(280 - 351) / 351] x 100
Subtract the new number by the original number
280 - 351 = -71
-71 ÷ 351 = -0.2022792022792023
-0.2022792022792023 x 100 = -20.23%