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<p>Let’s say that you work for a software as a subscription (SAAS) company that has existed for just over a year. The chief revenue officer wants to know the average lifetime value.</p>

<p>We know that the product costs $100 dollars per month, averages 10% in monthly churn, and the average customer sticks around for around 3.5 months.</p>

<p>Calculate the formula for the average lifetime value.</p>


<p>If a software-as-a-subscription company has a monthly churn rate of 20% for a product that costs $100, what would be the average lifetime value of a single customer?</p>


If a software-as-a-subscription company has a monthly churn rate of 20% for a product that costs $100, what would be the average lifetime value of a single customer?

Average Lifetime Value

Revenue Retention

<p>Let’s say you work for a search engine company. The company has increased the number of ads shown after a subset of searches. </p>

<p>After analyzing the data, we see that total amount of revenue is up but the total number of user searches is down. Is this good or bad?</p>


Determine whether the increase in total revenue is indeed beneficial for a search engine company.

Increase Search Ads

<p>Let’s say you work at Uber. You want to learn how long Uber rides are taking for individual users.</p>

<p>Given a <code>rides</code> table, write a query to find the average duration of all rides in minutes. Sort results by <code>passenger_user_id</code> ascending.</p>

<p><strong>Input</strong></p>

<p><strong>Example:</strong></p>

<p><code>rides</code> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>passenger_user_id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>start_dt</code></td>
<td>DATETIME</td>
</tr>

<tr>
<td><code>end_dt</code></td>
<td>DATETIME</td>
</tr>

<tr>
<td><code>distance</code></td>
<td>FLOAT</td>
</tr>

<tr>
<td><code>ride_region</code></td>
<td>VARCHAR</td>
</tr>

<tr>
<td><code>is_completed</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>
<p><strong>Output</strong></p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>passenger_user_id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>avg_time</code></td>
<td>FLOAT</td>
</tr>
</tbody>
</table>


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