Wellplace Insurance Company processes insurance policy applications in batches of 50. One day, they had 10 batches to process and, after inspection, it was found that four batches had nonconforming policies. One batch had three nonconformances, another had five, another had two, and another had one nonconformance. What were 

(a) The proportion nonconforming for each batch, 

(b) The nonconformances per unit (NPU), in total for the 10 batches?