101.3% is the change from 308 to 620
Calculation steps:
[( 620 - 308 ) ÷ 308] x 100 = 101.3%
Formula
Percentage change = [(620 - 308) / 308] x 100
Subtract the new number by the original number
620 - 308 = 312
312 ÷ 308 = 1.0129870129870129
1.0129870129870129 x 100 = 101.3%