64.04% is the change from 342 to 561
Calculation steps:
[( 561 - 342 ) ÷ 342] x 100 = 64.04%
Formula
Percentage change = [(561 - 342) / 342] x 100
Subtract the new number by the original number
561 - 342 = 219
219 ÷ 342 = 0.6403508771929824
0.6403508771929824 x 100 = 64.04%