51.47% is the change from 645 to 977
Calculation steps:
[( 977 - 645 ) ÷ 645] x 100 = 51.47%
Formula
Percentage change = [(977 - 645) / 645] x 100
Subtract the new number by the original number
977 - 645 = 332
332 ÷ 645 = 0.5147286821705427
0.5147286821705427 x 100 = 51.47%