Miricelwell Insurance Company processes insurance policy applications in batches of 100. One day, they had 12 batches to process and, after inspection, it was found that four batches had nonconforming policies. One batch had 3 non-conformances, another had 6, another had 2, and another had 1 nonconformance. What were 

(a) The proportion nonconforming for each batch,
(b) The non-conformances per unit (NPU), in total for the 12 batches

(c) The Total yield (TY) for the 12 batches?