21.35% is the change from 342 to 415
Calculation steps:
[( 415 - 342 ) ÷ 342] x 100 = 21.35%
Formula
Percentage change = [(415 - 342) / 342] x 100
Subtract the new number by the original number
415 - 342 = 73
73 ÷ 342 = 0.2134502923976608
0.2134502923976608 x 100 = 21.35%