# [JavaScript (Node.js)], 64 bytes

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    c=>a=>[,7.77,a.sort()[1]-a[2]?2:3,1,.1][new Set(a).size]+c/100|0

[Try it online!][TIO-jzlaeifo]

[JavaScript (Node.js)]: https://nodejs.org
[TIO-jzlaeifo]: https://tio.run/##bdBLbsMgEAbgPaeYJagTarAtN42cHqJLxAIRHLmKTGRQWvVxdhdDvAuzQOjTPzPiw9xMsPN4jbvJn9wy9Ivtj6Y/Kux416Hhwc@RMiX0ziip3@RrjQK50Gpyn/DuIjWMh/Hb6Sf7LKrqt1puZoboQgzQgyIKoEJIRwlsUGKr86vSmGjfFlp7SmwKiUzyThLrlKsfUYNtqntKZtpmpTmpoSxUl5Tc1shVqCtUb2vkKvRSNtw/JKIPhAx@BqqsH6eAMFq/Xu7r6mx0Jw1@KL/A4IcArOovjl/8mQ40ZxjNGcYO5G/5Bw "JavaScript (Node.js) – Try It Online"

I am certain that this is golfable, but there has to be at least one JS answer to an Arnauld challenge.