Based on the information given the interest rate the he borrow the money is 122.22%.
Using this formula
Interest rate=Repayment-Amount borrowed/Amount borrowed×100
Where:
Repayment=$20,000
Amount borrowed=$9,000
Let plug in the formula
Interest rate=$20,000-$9,000/$9,000×100
Interest rate=$11,000/$9,000×100
Interest rate=122.22%
Inconclusion the interest rate the he borrow the money is 122.22%.
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