270% is the change from 270 to 999
Calculation steps:
[( 999 - 270 ) ÷ 270] x 100 = 270%
Formula
Percentage change = [(999 - 270) / 270] x 100
Subtract the new number by the original number
999 - 270 = 729
729 ÷ 270 = 2.7
2.7 x 100 = 270%
Example