You inverted the mass ratio of Li-mass to compound-mass in the calculation.<p>price Li per ton from LiOH:<p><pre><code>    23.95 [mass of LiOH] &#x2F; 6.941 [mass of Li] * $14000 [$&#x2F;ton of LiOH]
    $48,310&#x2F;ton [of Li]
</code></pre>
price of Li per ton from Li2CO3<p><pre><code>    73.89 [mass of Li2CO3] &#x2F; (2*6.941) [mass of Li] * $10000 [$&#x2F;ton of Li2CO3]
    $53,230&#x2F;ton [of Li]</code></pre>