216.18% is the change from 309 to 977
Calculation steps:
[( 977 - 309 ) ÷ 309] x 100 = 216.18%
Formula
Percentage change = [(977 - 309) / 309] x 100
Subtract the new number by the original number
977 - 309 = 668
668 ÷ 309 = 2.161812297734628
2.161812297734628 x 100 = 216.18%