283.84% is the change from 99 to 380
Calculation steps:
[( 380 - 99 ) ÷ 99] x 100 = 283.84%
Formula
Percentage change = [(380 - 99) / 99] x 100
Subtract the new number by the original number
380 - 99 = 281
281 ÷ 99 = 2.8383838383838382
2.8383838383838382 x 100 = 283.84%