Another RV Park Calculation help needed

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TrayLo1201

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Lubbock, TX, United States
Hi there everyone, this is my first post to this forum. I am reviewing for my final in Elctrical Calculations and have this question: What is the demand load for a RV park that has these facilities? The system is a 120/240V, single-phase system.

Ten 20A sites
Fifteen 20A and 30A sites
Twenty 50A sites

The answer according to the answer key is 461A. However, I cannot get that exact number..closest I got was 479A. I've read A551.73 but my numbers are not adding up. Any help greatly appreciated
 
Please show your calculation that gets your answer, and we can comment on it.
That will probably be more helpful than just showing your our work, even if we can get the "book" answer.
 
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