330% is the change from 90 to 387
Calculation steps:
[( 387 - 90 ) ÷ 90] x 100 = 330%
Formula
Percentage change = [(387 - 90) / 90] x 100
Subtract the new number by the original number
387 - 90 = 297
297 ÷ 90 = 3.3
3.3 x 100 = 330%
Example