Lenore borrowed $400 to pay for car repairs. She needs to pay it back in 2 years with simple interest. Lenore wants to figure out the interest rate of her loan. What additional information does she need to find the interest rate?

Simple interest is calculated with I = P × r × t, where I is the interest, P is the principal, r is the rate, and t is the time. Lenore already knows the principal is $400 and the time is 2 years, so she needs to know the interest she will owe to solve for the rate. The correct choice is the interest she will owe.

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