A company that makes​ hair-care products had 4,000 people try a new shampoo. Of the 4,000 ​people, 16 had a mild allergic reaction. What percent of the people had a mild allergic​ reaction?

With: label the vertices and all the elements needed. find x

Can some one me with these questions

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