21.48% is the change from 284 to 345
Calculation steps:
[( 345 - 284 ) ÷ 284] x 100 = 21.48%
Formula
Percentage change = [(345 - 284) / 284] x 100
Subtract the new number by the original number
345 - 284 = 61
61 ÷ 284 = 0.2147887323943662
0.2147887323943662 x 100 = 21.48%