I need help please!!!

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

The total number of dental clinics total for the last 12 months was recorded

To decrease an amount by 16% what single multiplier would you use