Answer:
Explanation:
To calculate how long it will take John to recover his investment, we need to divide the cost of the degree by the difference in income between the two options.
$10,000 / ($35,000 - $20,000) = $10,000 / $15,000 = 0.67 years or 0.67*12 = 8 months.
So, it will take John 8 months to recover his investment if he goes to school.
Please note that this is a simplified calculation as it does not take into account the cost of living, taxes, and other expenses.