240% is the change from 50 to 170
Calculation steps:
[( 170 - 50 ) ÷ 50] x 100 = 240%
Formula
Percentage change = [(170 - 50) / 50] x 100
Subtract the new number by the original number
170 - 50 = 120
120 ÷ 50 = 2.4
2.4 x 100 = 240%
Example