150% is the change from 34 to 85
Calculation steps:
[( 85 - 34 ) ÷ 34] x 100 = 150%
Formula
Percentage change = [(85 - 34) / 34] x 100
Subtract the new number by the original number
85 - 34 = 51
51 ÷ 34 = 1.5
1.5 x 100 = 150%
Example