Question about eccentric billionaire from French's Special Relativity text

[gauss^2]

Homework Statement

This is question 1-9 from French's Special Relativity

Homework Equations

The equations are shown in my attempt at a solution below

The Attempt at a Solution

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The answer in the back of the book states it should cost about $50,000. Where did I make an error here? Or is the answer in the back of the book in error?

I apologise if this is improper to post screenshots instead of the actual text. I wrote this in LaTeX but with a bunch of macros I have defined, and can't remember how to do some of the writing in plain LaTeX to post the text here.

 

[TSny]

Is hydrogen gas monatomic or diatomic?

 

[gauss^2]

Is hydrogen gas monatomic or diatomic?

LOL, you're right. I know standard hydrogen occurs as a diatomic molecule but for some reason didn't connect the dots on tritium gas being diatomic too. Thanks!