204.76% is the change from 210 to 640
Calculation steps:
[( 640 - 210 ) ÷ 210] x 100 = 204.76%
Formula
Percentage change = [(640 - 210) / 210] x 100
Subtract the new number by the original number
640 - 210 = 430
430 ÷ 210 = 2.0476190476190474
2.0476190476190474 x 100 = 204.76%