146.38% is the change from 345 to 850
Calculation steps:
[( 850 - 345 ) ÷ 345] x 100 = 146.38%
Formula
Percentage change = [(850 - 345) / 345] x 100
Subtract the new number by the original number
850 - 345 = 505
505 ÷ 345 = 1.463768115942029
1.463768115942029 x 100 = 146.38%