209.62% is the change from 208 to 644
Calculation steps:
[( 644 - 208 ) ÷ 208] x 100 = 209.62%
Formula
Percentage change = [(644 - 208) / 208] x 100
Subtract the new number by the original number
644 - 208 = 436
436 ÷ 208 = 2.0961538461538463
2.0961538461538463 x 100 = 209.62%