Question: where did the rule of 72 come from
[{'answer': 'Summa de arithmetica', 'provenance': [{'wikipedia_id': '334320', 'title': 'Rule of 72', 'start_paragraph_id': 15, 'start_character': 42, 'end_paragraph_id': 15, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'of Luca Pacioli', 'provenance': [{'wikipedia_id': '334320', 'title': 'Rule of 72', 'start_paragraph_id': 15, 'start_character': 96, 'end_paragraph_id': 15, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '334320', 'title': 'Rule of 72', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 333, 'bleu_score': 0.909992945383792, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8911828872454802662}, 'section': 'Section::::History.\n'}]}]