21.43% is the change from 140 to 170
Calculation steps:
[( 170 - 140 ) ÷ 140] x 100 = 21.43%
Formula
Percentage change = [(170 - 140) / 140] x 100
Subtract the new number by the original number
170 - 140 = 30
30 ÷ 140 = 0.21428571428571427
0.21428571428571427 x 100 = 21.43%