290.91% is the change from 99 to 387
Calculation steps:
[( 387 - 99 ) ÷ 99] x 100 = 290.91%
Formula
Percentage change = [(387 - 99) / 99] x 100
Subtract the new number by the original number
387 - 99 = 288
288 ÷ 99 = 2.909090909090909
2.909090909090909 x 100 = 290.91%