Precious spends $4 on a magazine at a newsstand. When leaving the newsstand, she finds a quarter on the sidewalk. How much money does Precious have now compared to when she first arrived at the newsstand? I NEED TO KNOW

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