2100% is the change from 7 to 154
Calculation steps:
[( 154 - 7 ) ÷ 7] x 100 = 2100%
Formula
Percentage change = [(154 - 7) / 7] x 100
Subtract the new number by the original number
154 - 7 = 147
147 ÷ 7 = 21
21 x 100 = 2100%
Example