Hasan has an annual income of $24,000. He decides to take classes on line and at night so that he can continue to work. After 3 years he gets his degree and immediately starts earning $30,000 per year. If it takes Hasan 6 years to recover his investment for his education, how much did it cost him?

$36,000

Step-by-step explanation:

The difference in income is $6000.  After 6 years, the extra income totals to $36,000.  So that was the cost of the investment.

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215.92 dollars is the answer