12.3% is the change from 870 to 977
Calculation steps:
[( 977 - 870 ) ÷ 870] x 100 = 12.3%
Formula
Percentage change = [(977 - 870) / 870] x 100
Subtract the new number by the original number
977 - 870 = 107
107 ÷ 870 = 0.12298850574712644
0.12298850574712644 x 100 = 12.3%