214.29% is the change from 21 to 66
Calculation steps:
[( 66 - 21 ) ÷ 21] x 100 = 214.29%
Formula
Percentage change = [(66 - 21) / 21] x 100
Subtract the new number by the original number
66 - 21 = 45
45 ÷ 21 = 2.142857142857143
2.142857142857143 x 100 = 214.29%