51% is the change from 647 to 977
Calculation steps:
[( 977 - 647 ) ÷ 647] x 100 = 51%
Formula
Percentage change = [(977 - 647) / 647] x 100
Subtract the new number by the original number
977 - 647 = 330
330 ÷ 647 = 0.5100463678516228
0.5100463678516228 x 100 = 51%