On Friday 84% of the people who went to a cafe orders coffe there were 325 people who went to the cafe how many of these 325 customers bought coffe

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