Calculating a 7-percent per annum loan rate is easy to do. It involves converting the interest rate to a decimal and then multiplying that figure times the value of the loan.
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Loan Value as Number
Write the loan value as a number. For example, a $50,000 loan should be written as 50,000.
Change the 7-percent per annum rate to a decimal by writing it as 0.07.
Multiply 0.07 times 50,000 to get 3,500.
Change to Dollars
Write 3,500 as $3,500.
Interest Per Year
Read the loan as having an annual interest due of $3,500.
Multiply $3,500 times the number of years. For a five-year loan, the answer would be 5 times $3,500 = $17,500.