8150% is the change from 12 to 990
Calculation steps:
[( 990 - 12 ) ÷ 12] x 100 = 8150%
Formula
Percentage change = [(990 - 12) / 12] x 100
Subtract the new number by the original number
990 - 12 = 978
978 ÷ 12 = 81.5
81.5 x 100 = 8150%
Example