99.39% is the change from 490 to 977
Calculation steps:
[( 977 - 490 ) ÷ 490] x 100 = 99.39%
Formula
Percentage change = [(977 - 490) / 490] x 100
Subtract the new number by the original number
977 - 490 = 487
487 ÷ 490 = 0.9938775510204082
0.9938775510204082 x 100 = 99.39%