27.27% is the change from 55 to 70
Calculation steps:
[( 70 - 55 ) ÷ 55] x 100 = 27.27%
Formula
Percentage change = [(70 - 55) / 55] x 100
Subtract the new number by the original number
70 - 55 = 15
15 ÷ 55 = 0.2727272727272727
0.2727272727272727 x 100 = 27.27%