42.4% is the change from 342 to 487
Calculation steps:
[( 487 - 342 ) ÷ 342] x 100 = 42.4%
Formula
Percentage change = [(487 - 342) / 342] x 100
Subtract the new number by the original number
487 - 342 = 145
145 ÷ 342 = 0.4239766081871345
0.4239766081871345 x 100 = 42.4%