446.28% is the change from 121 to 661
Calculation steps:
[( 661 - 121 ) ÷ 121] x 100 = 446.28%
Formula
Percentage change = [(661 - 121) / 121] x 100
Subtract the new number by the original number
661 - 121 = 540
540 ÷ 121 = 4.462809917355372
4.462809917355372 x 100 = 446.28%