Step 1 :First, we need to calculate the amount that KeeKee borrowed. This is the total cost of the car minus the upfront payment. So, \(25320 - 5640 = 19680\). Therefore, KeeKee borrowed \(\$19680\).
Step 2 :Next, we can calculate the interest paid over the life of the loan using the formula for simple interest, which is Principal * Rate * Time. The rate is given as a percentage, so we need to convert it to a decimal by dividing by 100. The time is given in years, so we don't need to convert it.
Step 3 :Substituting the values into the formula, we get \(19680 * \frac{5}{100} * 5 = 4920\). Therefore, KeeKee will pay \(\$4920\) in interest over the life of the loan.
Step 4 :Final Answer: KeeKee will pay \(\boxed{4920}\) dollars in interest over the life of the loan.