102.4% is the change from 208 to 421
Calculation steps:
[( 421 - 208 ) ÷ 208] x 100 = 102.4%
Formula
Percentage change = [(421 - 208) / 208] x 100
Subtract the new number by the original number
421 - 208 = 213
213 ÷ 208 = 1.0240384615384615
1.0240384615384615 x 100 = 102.4%