280.81% is the change from 99 to 377
Calculation steps:
[( 377 - 99 ) ÷ 99] x 100 = 280.81%
Formula
Percentage change = [(377 - 99) / 99] x 100
Subtract the new number by the original number
377 - 99 = 278
278 ÷ 99 = 2.808080808080808
2.808080808080808 x 100 = 280.81%