Detailed Instructions: This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
Q: Passage: The Oxford Olympics Study 2016 found that sports-related costs for the Summer Games since 1960 are on average USD 5.2 billion and for the Winter Games USD 3.1 billion. This does not include wider infrastructure costs like roads, urban rail, and airports, which often cost as much or more than the sports-related costs. The most expensive Summer Games are Beijing at USD 40-44 billion and the most expensive Winter Games are Sochi 2014 at USD 51 billion. As of 2016, costs per athlete are on average USD 599,000 for the Summer Games and USD 1.3 million for the Winter Games. For London 2012, cost per athlete was USD 1.4 million; for Sochi 2014, USD 7.9 million.
A:
How many billions higher was the Sochi 2014 Olympic cost than the average Winter Game cost?