<h1>The investment of the father,brain teaser</h1>

A puzzle that in order to find the answer you have to think outside the box

  A father makes a future investment for his son
He opens an account and whenever his son has a birthday he deposits $ 100
When his son was 20 he went to collect the money and to his great surprise he got only $ 500.
How is this done?

 This type of riddles belongs to a series of puzzles that we need to think outside the box.
These brain tests will improve your logical abilities and lateral skills.

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