6500% is the change from 15 to 990
Calculation steps:
[( 990 - 15 ) ÷ 15] x 100 = 6500%
Formula
Percentage change = [(990 - 15) / 15] x 100
Subtract the new number by the original number
990 - 15 = 975
975 ÷ 15 = 65
65 x 100 = 6500%
Example