Total number of blue candies = 20 + 30 = 50
Number of blue candies without nut = 20
Probability of picking a blue candy without a nut = (Number of blue candies with nut) /(Total number of blue candies)
So, Probability of picking a blue candy without a nut =[tex] \frac{20}{50} =0.4=40[/tex]%
Thus, the correct answer is option A