49.1% is the change from 670 to 999
Calculation steps:
[( 999 - 670 ) ÷ 670] x 100 = 49.1%
Formula
Percentage change = [(999 - 670) / 670] x 100
Subtract the new number by the original number
999 - 670 = 329
329 ÷ 670 = 0.491044776119403
0.491044776119403 x 100 = 49.1%