218.3% is the change from 306 to 974
Calculation steps:
[( 974 - 306 ) ÷ 306] x 100 = 218.3%
Formula
Percentage change = [(974 - 306) / 306] x 100
Subtract the new number by the original number
974 - 306 = 668
668 ÷ 306 = 2.183006535947712
2.183006535947712 x 100 = 218.3%