Rolls-Royce Trent 900: Unit cost $46 million https://en.wikipedia.org/wiki/Rolls-Royce_Trent_900
Engine Alliance GP7000: Unit cost $13.5 million (2006 dollars) https://en.wikipedia.org/wiki/Engine_Alliance_GP7000
In this news, Emirates pays $30.5 million for the Trent 900: https://www.bloomberg.com/news/articles/2016-11-18/emirates-says-rolls-royce-a380-engines-not-up-to-agreed-standard
$30.5 million is about 2/3 of $46 million.
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