9.68% is the change from 155 to 170
Calculation steps:
[( 170 - 155 ) ÷ 155] x 100 = 9.68%
Formula
Percentage change = [(170 - 155) / 155] x 100
Subtract the new number by the original number
170 - 155 = 15
15 ÷ 155 = 0.0967741935483871
0.0967741935483871 x 100 = 9.68%