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{{ printedBook.courseTrack.name }} {{ printedBook.name }} When a bank lends money they charge a fee called the simple interest. The interest is based on a ratio of the loan. This percentage indicates the amount of money that should be paid to the bank each year. If the interest rate is $3\, \%$ on a $1000$ dollar loan, it costs $0.03\cdot 1000=30 \text{ USD}$
each year until the loan is paid. There is a difference in interest rate and interest cost. The **interest rate** is the percentage of the loan that should be paid, in this case, $3\,\%.$ Unlike the **interest cost**, that is the actual sum that has to be paid in interest each year, for this loan it's $30$ USD.