80% is the change from 270 to 486
Calculation steps:
[( 486 - 270 ) ÷ 270] x 100 = 80%
Formula
Percentage change = [(486 - 270) / 270] x 100
Subtract the new number by the original number
486 - 270 = 216
216 ÷ 270 = 0.8
0.8 x 100 = 80%
Example