2150% is the change from 4 to 90
Calculation steps:
[( 90 - 4 ) ÷ 4] x 100 = 2150%
Formula
Percentage change = [(90 - 4) / 4] x 100
Subtract the new number by the original number
90 - 4 = 86
86 ÷ 4 = 21.5
21.5 x 100 = 2150%
Example