Q: 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.
Passage: On 1 April 2007, the parallel market was asking ZWD 30,000 for $1 USD. By year end, it was down to about ZWD 2,000,000. On 18 January 2008, the Reserve Bank of Zimbabwe began to issue higher denomination ZWD bearer cheques (a banknote with an expiry date), including $10 million bearer cheques - each of which was worth less than US $1.35 (70p Sterling; 0.90 Euro) on the parallel market at the time of first issue. On 4 April 2008 the Reserve Bank of Zimbabwe introduced new $25 million and $50 million bearer cheques. At the time of first issue they were worth US$0.70 & US$1.40 on the parallel market respectively.
A:
How many US dollars were the $50 million bearer cheques issued by the Reserve Bank of Zimbabwe worth?