Interest is a concept familiar to most people: every credit card in existence has a term called annual percentage rate (APR), which is an interest rate. Suppose you charged $1,000 to a credit card that has a minimum payment each month equal to the interest owed. Can you figure out how much the interest rate is based on this amount? The formula for simple interest is “I =r*P*m” where I is the amount you will pay in interest, r is the rate at which interest will accrue, P is the principal (the amount borrowed), and m is the number of times the interest is applied.

To solve for the interest rate of your credit card, you need to understand which variables in the above formula you have. If your minimum monthly payment is $22 on the $1,000 credit card bill, which variables do you know the values of?

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Manipulate the formula so it will calculate the interest rate you are paying instead of the amount of money you are paying.