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Thomas Ewing borrowed $100 from a loan company for 12 months. He signed a note to repay the loan at $10 per month.
How much interest did he have to pay?
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He loaned $100, and payed back 10*12 = 120 dollars.
Everything happened in one year, so the interest is $20 and the percentage is
= 20% per year. ANSWER
Solved.