45.75% is the change from 212 to 309
Calculation steps:
[( 309 - 212 ) ÷ 212] x 100 = 45.75%
Formula
Percentage change = [(309 - 212) / 212] x 100
Subtract the new number by the original number
309 - 212 = 97
97 ÷ 212 = 0.45754716981132076
0.45754716981132076 x 100 = 45.75%