Calculate the percentage of Pentland Javelin potatoes affected by powdery scab disease - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1

To find the percentage of Pentland Javelin potatoes affected by powdery scab disease, we use the formula:

ext{Percentage} = rac{ ext{Number of affected potatoes}}{ ext{Total harvested potatoes}} imes 100

Substituting the values:

ext{Percentage} = rac{140}{350} imes 100

Calculating this gives:

$$ext{Percentage} = 0.4 imes 100 = 40\%$$

Thus, 40% of the Pentland Javelin potatoes are affected by powdery scab disease.