Is there an Outlier ? 7, 6, 4, 8, 6, 5, 51, 2, 5, 7, 8, 4, 5, 6,​

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax