215.46% is the change from 97 to 306
Calculation steps:
[( 306 - 97 ) ÷ 97] x 100 = 215.46%
Formula
Percentage change = [(306 - 97) / 97] x 100
Subtract the new number by the original number
306 - 97 = 209
209 ÷ 97 = 2.154639175257732
2.154639175257732 x 100 = 215.46%