2150% is the change from 12 to 270
Calculation steps:
[( 270 - 12 ) ÷ 12] x 100 = 2150%
Formula
Percentage change = [(270 - 12) / 12] x 100
Subtract the new number by the original number
270 - 12 = 258
258 ÷ 12 = 21.5
21.5 x 100 = 2150%
Example