216.5% is the change from 309 to 978
Calculation steps:
[( 978 - 309 ) ÷ 309] x 100 = 216.5%
Formula
Percentage change = [(978 - 309) / 309] x 100
Subtract the new number by the original number
978 - 309 = 669
669 ÷ 309 = 2.1650485436893203
2.1650485436893203 x 100 = 216.5%