294.25% is the change from 87 to 343
Calculation steps:
[( 343 - 87 ) ÷ 87] x 100 = 294.25%
Formula
Percentage change = [(343 - 87) / 87] x 100
Subtract the new number by the original number
343 - 87 = 256
256 ÷ 87 = 2.942528735632184
2.942528735632184 x 100 = 294.25%