title: Formula for the total of a gradual percentage increase N times
body: <p>What is the formula for calculating the final value after a gradual percentage increase fixed number of times?</p>
  <p>Each next value equals the previous value increased by the same <code>X</code> percentage. And I want to calculate the final value.</p>
  <p><strong>We have:</strong></p>
  <ul>
  <li><code>I</code> - initial value</li>
  <li><code>X</code> - percentage increase per step</li>
  <li><code>N</code> - number of increases / steps</li>
  </ul>
  <p><strong>Needed:</strong></p>
  <p><code>f(I, X, N)</code> = total value after increasing <code>I</code> by percentage <code>X</code>, <code>N</code> number of times.</p>