137.61% is the change from 343 to 815
Calculation steps:
[( 815 - 343 ) ÷ 343] x 100 = 137.61%
Formula
Percentage change = [(815 - 343) / 343] x 100
Subtract the new number by the original number
815 - 343 = 472
472 ÷ 343 = 1.3760932944606414
1.3760932944606414 x 100 = 137.61%