210% is the change from 50 to 155
Calculation steps:
[( 155 - 50 ) ÷ 50] x 100 = 210%
Formula
Percentage change = [(155 - 50) / 50] x 100
Subtract the new number by the original number
155 - 50 = 105
105 ÷ 50 = 2.1
2.1 x 100 = 210%
Example