52.09% is the change from 645 to 981
Calculation steps:
[( 981 - 645 ) ÷ 645] x 100 = 52.09%
Formula
Percentage change = [(981 - 645) / 645] x 100
Subtract the new number by the original number
981 - 645 = 336
336 ÷ 645 = 0.5209302325581395
0.5209302325581395 x 100 = 52.09%