15.42% is the change from 830 to 958
Calculation steps:
[( 958 - 830 ) ÷ 830] x 100 = 15.42%
Formula
Percentage change = [(958 - 830) / 830] x 100
Subtract the new number by the original number
958 - 830 = 128
128 ÷ 830 = 0.15421686746987953
0.15421686746987953 x 100 = 15.42%