975% is the change from 12 to 129
Calculation steps:
[( 129 - 12 ) ÷ 12] x 100 = 975%
Formula
Percentage change = [(129 - 12) / 12] x 100
Subtract the new number by the original number
129 - 12 = 117
117 ÷ 12 = 9.75
9.75 x 100 = 975%
Example