You are purchasing a refrigerator for $1000 T. V with 20% sales tax. How much money would you need to pay for it and still have $50 left over?

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