Question: how much was the tax that caused the boston tea party
[{'answer': 'three pence', 'provenance': [{'wikipedia_id': '4608353', 'title': 'Boston Tea Party', 'start_paragraph_id': 14, 'start_character': 446, 'end_paragraph_id': 14, 'end_character': 457, 'bleu_score': 1.0, 'section': 'Section::::Background.:Townshend duty crisis.\n'}]}, {'provenance': [{'wikipedia_id': '4608353', 'title': 'Boston Tea Party', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 732, 'bleu_score': 0.9705733906555171, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12033001437744807022}, 'section': 'Section::::Tea Act of 1773.\n'}]}]