6.05% is the change from 397 to 421
Calculation steps:
[( 421 - 397 ) ÷ 397] x 100 = 6.05%
Formula
Percentage change = [(421 - 397) / 397] x 100
Subtract the new number by the original number
421 - 397 = 24
24 ÷ 397 = 0.060453400503778336
0.060453400503778336 x 100 = 6.05%