What decimal number is the smallest 1.001, 1.1, 1.01, or 1.011

Someone . me. compound probability

Icould really use some with this question.

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