Calculation to find Level
<p>If I know the value of <code>$c_xp</code>, how can I find <code>$c_level</code> without writing 100's of if statements.</p>

<pre><code>Level     XP
1         0-99
2         100
3         500  +400 xp points from last level
4         1000 +500 xp points from last level
5         1600 +600 xp points from last level
6         2300 +700 xp points from last level
7         3100 +800 xp points from last level
8         4000 +900 xp points from last level
</code></pre>

<p>And so on.</p>

<pre><code>$c_level = ;
</code></pre>
