The coefficient of correlation for the model is 0.72. If Donna Battista returns from a 300?-mile trip that took her out of town for 5 ?days, the expected amount that she should claim as expense? = ?$467.5, After the 300 mile and 55?-day ?trip, Battista submitted a reimbursement request for ?$685, which is different than the predicted value. What is the percentage of variation in the trip cost that can be explained by the model?