10% is the change from 50 to 55
Calculation steps:
[( 55 - 50 ) ÷ 50] x 100 = 10%
Formula
Percentage change = [(55 - 50) / 50] x 100
Subtract the new number by the original number
55 - 50 = 5
5 ÷ 50 = 0.1
0.1 x 100 = 10%
Example