677.11% is the change from 83 to 645
Calculation steps:
[( 645 - 83 ) ÷ 83] x 100 = 677.11%
Formula
Percentage change = [(645 - 83) / 83] x 100
Subtract the new number by the original number
645 - 83 = 562
562 ÷ 83 = 6.771084337349397
6.771084337349397 x 100 = 677.11%