Question: how much did russia sell alaska to the us for
[{'answer': '$7.2 million', 'provenance': [{'wikipedia_id': '193703', 'title': 'Alaska Purchase', 'start_paragraph_id': 3, 'start_character': 73, 'end_paragraph_id': 3, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '193703', 'title': 'Alaska Purchase', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 774, 'bleu_score': 0.822897776739791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4197625296081087922}, 'section': 'Section::::History.\n'}]}]